* Package:    sci-libs/flann-1.8.4-r1
 * Repository: gentoo
 * Maintainer: sci@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux openmp userland_GNU
 * FEATURES:   preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
>>> Unpacking flann-1.8.4-src.zip to /var/tmp/portage/sci-libs/flann-1.8.4-r1/work
>>> Source unpacked in /var/tmp/portage/sci-libs/flann-1.8.4-r1/work
>>> Preparing source in /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src ...
 * Applying flann-1.8.4-examples.patch ...
 [ ok ]
 * Applying flann-1.8.4-options.patch ...
 [ ok ]
 * Applying flann-1.8.4-CUDA_NVCC_FLAGS.patch ...
 [ ok ]
 * Applying flann-1.8.4-cuda5.5.patch ...
 [ ok ]
 * Applying flann-1.8.4-multilib.patch ...
 [ ok ]
 * Applying flann-1.8.4-docdir.patch ...
 [ ok ]
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src ...
>>> Working in BUILD_DIR: "/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build"
cmake --no-warn-unused-cli -C /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build/gentoo_common_config.cmake -G Unix Makefiles -DCMAKE_INSTALL_PREFIX=/usr -DBUILD_C_BINDINGS=ON -DBUILD_PYTHON_BINDINGS=OFF -DPYTHON_EXECUTABLE= -DDOCDIR=share/doc/flann-1.8.4-r1 -DBUILD_CUDA_LIB=OFF -DBUILD_examples=OFF -DBUILD_EXAMPLES=OFF -DBUILD_Examples=OFF -DBUILD_doc=OFF -DBUILD_DOC=OFF -DBUILD_Doc=OFF -DBUILD_TESTS=OFF -DBUILD_MATLAB_BINDINGS=OFF -DUSE_mpi=OFF -DUSE_MPI=OFF -DUSE_Mpi=OFF -DUSE_openmp=ON -DUSE_OPENMP=ON -DUSE_Openmp=ON -DCMAKE_BUILD_TYPE=Gentoo -DCMAKE_INSTALL_DO_STRIP=OFF -DCMAKE_USER_MAKE_RULES_OVERRIDE=/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build/gentoo_rules.cmake -DCMAKE_TOOLCHAIN_FILE=/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build/gentoo_toolchain.cmake  /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src
Not searching for unused variables given on the command line.
loading initial cache file /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build/gentoo_common_config.cmake
-- The C compiler identification is GNU 6.2.0
-- The CXX compiler identification is GNU 6.2.0
-- Check for working C compiler: /usr/bin/x86_64-pc-linux-gnu-gcc
-- Check for working C compiler: /usr/bin/x86_64-pc-linux-gnu-gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/x86_64-pc-linux-gnu-g++
-- Check for working CXX compiler: /usr/bin/x86_64-pc-linux-gnu-g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Could NOT find PythonInterp (missing:  PYTHON_EXECUTABLE) 
-- Could NOT find HDF5 (missing:  HDF5_LIBRARIES HDF5_INCLUDE_DIRS HDF5_HL_LIBRARIES) 
CMake Warning at CMakeLists.txt:79 (message):
  hdf5 library not found, some tests will not be run


-- Could NOT find GTest (missing:  GTEST_LIBRARY GTEST_INCLUDE_DIR GTEST_MAIN_LIBRARY) 
CMake Warning at CMakeLists.txt:118 (message):
  gtest library not found, some tests will not be run


-- Try OpenMP C flag = [-fopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Success
-- Try OpenMP CXX flag = [-fopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Success
-- Found OpenMP: -fopenmp  
-- Install prefix: /usr
-- Build type: Gentoo
-- Building C bindings: ON
-- Building examples: OFF
-- Building tests: OFF
-- Building documentation: OFF
-- Building python bindings: OFF
-- Building matlab bindings: OFF
-- Building CUDA library: OFF
-- Using OpenMP support: ON
-- Using MPI support: OFF
-- <<< Gentoo configuration >>>
Build type      Gentoo
Install path    /usr
Compiler flags:
C               -march=native -O2 -pipe  -fopenmp
C++             -march=native -O2 -pipe  -fopenmp
Linker flags:
Executable       -Wl,-O1 -Wl,--as-needed 
Module           -Wl,-O1 -Wl,--as-needed
Shared           -Wl,-O1 -Wl,--as-needed

-- Configuring done
-- Generating done
-- Build files have been written to: /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build
>>> Source configured.
>>> Compiling source in /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src ...
>>> Working in BUILD_DIR: "/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build"
make -j1 VERBOSE=1 
/usr/bin/cmake -H/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src -B/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build --check-build-system CMakeFiles/Makefile.cmake 0
/usr/bin/cmake -E cmake_progress_start /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build/CMakeFiles /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build/CMakeFiles/progress.marks
make -f CMakeFiles/Makefile2 all
make[1]: Entering directory '/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build'
make -f src/cpp/CMakeFiles/flann_s.dir/build.make src/cpp/CMakeFiles/flann_s.dir/depend
make[2]: Entering directory '/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build'
cd /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build/src/cpp /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build/src/cpp/CMakeFiles/flann_s.dir/DependInfo.cmake
Dependee "/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build/src/cpp/CMakeFiles/flann_s.dir/DependInfo.cmake" is newer than depender "/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build/src/cpp/CMakeFiles/flann_s.dir/depend.internal".
Dependee "/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build/src/cpp/CMakeFiles/CMakeDirectoryInformation.cmake" is newer than depender "/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build/src/cpp/CMakeFiles/flann_s.dir/depend.internal".
Scanning dependencies of target flann_s
make[2]: Leaving directory '/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build'
make -f src/cpp/CMakeFiles/flann_s.dir/build.make src/cpp/CMakeFiles/flann_s.dir/build
make[2]: Entering directory '/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build'
[ 16%] Building CXX object src/cpp/CMakeFiles/flann_s.dir/flann/flann.cpp.o
cd /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build/src/cpp && /usr/bin/x86_64-pc-linux-gnu-g++  -DFLANN_STATIC -D_FLANN_VERSION=1.8.4 -I/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp   -DNDEBUG -march=native -O2 -pipe  -fopenmp   -Wall -Wno-unknown-pragmas -Wno-unused-function -fPIC -o CMakeFiles/flann_s.dir/flann/flann.cpp.o -c /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp
In file included from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/util/params.h:33:0,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:42,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/util/any.h: In member function ‘virtual void flann::anyimpl::big_any_policy<T>::static_delete(void**)’:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/util/any.h:79:9: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation]
         if (* x) delete (* reinterpret_cast<T**>(x)); *x = NULL;
         ^~
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/util/any.h:79:55: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’
         if (* x) delete (* reinterpret_cast<T**>(x)); *x = NULL;
                                                       ^
In file included from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/autotuned_index.h:35:0,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/all_indices.h:43,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:45,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/nn/ground_truth.h: In function ‘void flann::find_nearest(const flann::Matrix<typename Distance::ElementType>&, typename Distance::ElementType*, size_t*, size_t, size_t, Distance)’:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/nn/ground_truth.h:45:44: warning: typedef ‘ElementType’ locally defined but not used [-Wunused-local-typedefs]
     typedef typename Distance::ElementType ElementType;
                                            ^~~~~~~~~~~
In file included from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/all_indices.h:36:0,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:45,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h: In instantiation of ‘void flann::KDTreeIndex<Distance>::addPointToTree(flann::KDTreeIndex<Distance>::NodePtr, int) [with Distance = flann::KL_Divergence<double>; flann::KDTreeIndex<Distance>::NodePtr = flann::KDTreeIndex<flann::KL_Divergence<double> >::Node*]’:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:154:35:   required from ‘void flann::KDTreeIndex<Distance>::addPoints(const flann::Matrix<typename Distance::ElementType>&, float) [with Distance = flann::KL_Divergence<double>; typename Distance::ElementType = double]’
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:884:1:   required from here
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:666:39: error: call of overloaded ‘abs(flann::KDTreeIndex<flann::KL_Divergence<double> >::ElementType)’ is ambiguous
                 ElementType span = abs(point[i]-leaf_point[i]);
                                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:75:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/include/stdlib.h:774:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:185:3: note: candidate: __int128 std::abs(__int128)
   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:180:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:172:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
In file included from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/all_indices.h:36:0,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:45,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h: In instantiation of ‘void flann::KDTreeIndex<Distance>::addPointToTree(flann::KDTreeIndex<Distance>::NodePtr, int) [with Distance = flann::ChiSquareDistance<double>; flann::KDTreeIndex<Distance>::NodePtr = flann::KDTreeIndex<flann::ChiSquareDistance<double> >::Node*]’:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:154:35:   required from ‘void flann::KDTreeIndex<Distance>::addPoints(const flann::Matrix<typename Distance::ElementType>&, float) [with Distance = flann::ChiSquareDistance<double>; typename Distance::ElementType = double]’
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:884:1:   required from here
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:666:39: error: call of overloaded ‘abs(flann::KDTreeIndex<flann::ChiSquareDistance<double> >::ElementType)’ is ambiguous
                 ElementType span = abs(point[i]-leaf_point[i]);
                                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:75:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/include/stdlib.h:774:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:185:3: note: candidate: __int128 std::abs(__int128)
   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:180:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:172:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
In file included from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/all_indices.h:36:0,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:45,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h: In instantiation of ‘void flann::KDTreeIndex<Distance>::addPointToTree(flann::KDTreeIndex<Distance>::NodePtr, int) [with Distance = flann::HellingerDistance<double>; flann::KDTreeIndex<Distance>::NodePtr = flann::KDTreeIndex<flann::HellingerDistance<double> >::Node*]’:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:154:35:   required from ‘void flann::KDTreeIndex<Distance>::addPoints(const flann::Matrix<typename Distance::ElementType>&, float) [with Distance = flann::HellingerDistance<double>; typename Distance::ElementType = double]’
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:884:1:   required from here
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:666:39: error: call of overloaded ‘abs(flann::KDTreeIndex<flann::HellingerDistance<double> >::ElementType)’ is ambiguous
                 ElementType span = abs(point[i]-leaf_point[i]);
                                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:75:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/include/stdlib.h:774:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:185:3: note: candidate: __int128 std::abs(__int128)
   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:180:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:172:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
In file included from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/all_indices.h:36:0,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:45,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h: In instantiation of ‘void flann::KDTreeIndex<Distance>::addPointToTree(flann::KDTreeIndex<Distance>::NodePtr, int) [with Distance = flann::HistIntersectionDistance<double>; flann::KDTreeIndex<Distance>::NodePtr = flann::KDTreeIndex<flann::HistIntersectionDistance<double> >::Node*]’:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:154:35:   required from ‘void flann::KDTreeIndex<Distance>::addPoints(const flann::Matrix<typename Distance::ElementType>&, float) [with Distance = flann::HistIntersectionDistance<double>; typename Distance::ElementType = double]’
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:884:1:   required from here
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:666:39: error: call of overloaded ‘abs(flann::KDTreeIndex<flann::HistIntersectionDistance<double> >::ElementType)’ is ambiguous
                 ElementType span = abs(point[i]-leaf_point[i]);
                                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:75:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/include/stdlib.h:774:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:185:3: note: candidate: __int128 std::abs(__int128)
   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:180:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:172:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
In file included from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/all_indices.h:36:0,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:45,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h: In instantiation of ‘void flann::KDTreeIndex<Distance>::addPointToTree(flann::KDTreeIndex<Distance>::NodePtr, int) [with Distance = flann::MinkowskiDistance<double>; flann::KDTreeIndex<Distance>::NodePtr = flann::KDTreeIndex<flann::MinkowskiDistance<double> >::Node*]’:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:154:35:   required from ‘void flann::KDTreeIndex<Distance>::addPoints(const flann::Matrix<typename Distance::ElementType>&, float) [with Distance = flann::MinkowskiDistance<double>; typename Distance::ElementType = double]’
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:884:1:   required from here
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:666:39: error: call of overloaded ‘abs(flann::KDTreeIndex<flann::MinkowskiDistance<double> >::ElementType)’ is ambiguous
                 ElementType span = abs(point[i]-leaf_point[i]);
                                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:75:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/include/stdlib.h:774:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:185:3: note: candidate: __int128 std::abs(__int128)
   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:180:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:172:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
In file included from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/all_indices.h:36:0,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:45,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h: In instantiation of ‘void flann::KDTreeIndex<Distance>::addPointToTree(flann::KDTreeIndex<Distance>::NodePtr, int) [with Distance = flann::L1<double>; flann::KDTreeIndex<Distance>::NodePtr = flann::KDTreeIndex<flann::L1<double> >::Node*]’:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:154:35:   required from ‘void flann::KDTreeIndex<Distance>::addPoints(const flann::Matrix<typename Distance::ElementType>&, float) [with Distance = flann::L1<double>; typename Distance::ElementType = double]’
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:884:1:   required from here
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:666:39: error: call of overloaded ‘abs(flann::KDTreeIndex<flann::L1<double> >::ElementType)’ is ambiguous
                 ElementType span = abs(point[i]-leaf_point[i]);
                                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:75:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/include/stdlib.h:774:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:185:3: note: candidate: __int128 std::abs(__int128)
   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:180:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:172:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
In file included from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/all_indices.h:36:0,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:45,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h: In instantiation of ‘void flann::KDTreeIndex<Distance>::addPointToTree(flann::KDTreeIndex<Distance>::NodePtr, int) [with Distance = flann::L2<double>; flann::KDTreeIndex<Distance>::NodePtr = flann::KDTreeIndex<flann::L2<double> >::Node*]’:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:154:35:   required from ‘void flann::KDTreeIndex<Distance>::addPoints(const flann::Matrix<typename Distance::ElementType>&, float) [with Distance = flann::L2<double>; typename Distance::ElementType = double]’
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:884:1:   required from here
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:666:39: error: call of overloaded ‘abs(flann::KDTreeIndex<flann::L2<double> >::ElementType)’ is ambiguous
                 ElementType span = abs(point[i]-leaf_point[i]);
                                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:75:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/include/stdlib.h:774:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:185:3: note: candidate: __int128 std::abs(__int128)
   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:180:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:172:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
In file included from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/all_indices.h:36:0,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:45,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h: In instantiation of ‘void flann::KDTreeIndex<Distance>::addPointToTree(flann::KDTreeIndex<Distance>::NodePtr, int) [with Distance = flann::KL_Divergence<float>; flann::KDTreeIndex<Distance>::NodePtr = flann::KDTreeIndex<flann::KL_Divergence<float> >::Node*]’:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:154:35:   required from ‘void flann::KDTreeIndex<Distance>::addPoints(const flann::Matrix<typename Distance::ElementType>&, float) [with Distance = flann::KL_Divergence<float>; typename Distance::ElementType = float]’
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:884:1:   required from here
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:666:39: error: call of overloaded ‘abs(flann::KDTreeIndex<flann::KL_Divergence<float> >::ElementType)’ is ambiguous
                 ElementType span = abs(point[i]-leaf_point[i]);
                                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:75:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/include/stdlib.h:774:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:185:3: note: candidate: __int128 std::abs(__int128)
   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:180:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:172:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
In file included from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/all_indices.h:36:0,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:45,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h: In instantiation of ‘void flann::KDTreeIndex<Distance>::addPointToTree(flann::KDTreeIndex<Distance>::NodePtr, int) [with Distance = flann::ChiSquareDistance<float>; flann::KDTreeIndex<Distance>::NodePtr = flann::KDTreeIndex<flann::ChiSquareDistance<float> >::Node*]’:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:154:35:   required from ‘void flann::KDTreeIndex<Distance>::addPoints(const flann::Matrix<typename Distance::ElementType>&, float) [with Distance = flann::ChiSquareDistance<float>; typename Distance::ElementType = float]’
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:884:1:   required from here
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:666:39: error: call of overloaded ‘abs(flann::KDTreeIndex<flann::ChiSquareDistance<float> >::ElementType)’ is ambiguous
                 ElementType span = abs(point[i]-leaf_point[i]);
                                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:75:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/include/stdlib.h:774:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:185:3: note: candidate: __int128 std::abs(__int128)
   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:180:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:172:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
In file included from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/all_indices.h:36:0,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:45,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h: In instantiation of ‘void flann::KDTreeIndex<Distance>::addPointToTree(flann::KDTreeIndex<Distance>::NodePtr, int) [with Distance = flann::HellingerDistance<float>; flann::KDTreeIndex<Distance>::NodePtr = flann::KDTreeIndex<flann::HellingerDistance<float> >::Node*]’:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:154:35:   required from ‘void flann::KDTreeIndex<Distance>::addPoints(const flann::Matrix<typename Distance::ElementType>&, float) [with Distance = flann::HellingerDistance<float>; typename Distance::ElementType = float]’
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:884:1:   required from here
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:666:39: error: call of overloaded ‘abs(flann::KDTreeIndex<flann::HellingerDistance<float> >::ElementType)’ is ambiguous
                 ElementType span = abs(point[i]-leaf_point[i]);
                                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:75:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/include/stdlib.h:774:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:185:3: note: candidate: __int128 std::abs(__int128)
   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:180:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:172:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
In file included from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/all_indices.h:36:0,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:45,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h: In instantiation of ‘void flann::KDTreeIndex<Distance>::addPointToTree(flann::KDTreeIndex<Distance>::NodePtr, int) [with Distance = flann::HistIntersectionDistance<float>; flann::KDTreeIndex<Distance>::NodePtr = flann::KDTreeIndex<flann::HistIntersectionDistance<float> >::Node*]’:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:154:35:   required from ‘void flann::KDTreeIndex<Distance>::addPoints(const flann::Matrix<typename Distance::ElementType>&, float) [with Distance = flann::HistIntersectionDistance<float>; typename Distance::ElementType = float]’
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:884:1:   required from here
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:666:39: error: call of overloaded ‘abs(flann::KDTreeIndex<flann::HistIntersectionDistance<float> >::ElementType)’ is ambiguous
                 ElementType span = abs(point[i]-leaf_point[i]);
                                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:75:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/include/stdlib.h:774:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:185:3: note: candidate: __int128 std::abs(__int128)
   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:180:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:172:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
In file included from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/all_indices.h:36:0,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:45,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h: In instantiation of ‘void flann::KDTreeIndex<Distance>::addPointToTree(flann::KDTreeIndex<Distance>::NodePtr, int) [with Distance = flann::MinkowskiDistance<float>; flann::KDTreeIndex<Distance>::NodePtr = flann::KDTreeIndex<flann::MinkowskiDistance<float> >::Node*]’:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:154:35:   required from ‘void flann::KDTreeIndex<Distance>::addPoints(const flann::Matrix<typename Distance::ElementType>&, float) [with Distance = flann::MinkowskiDistance<float>; typename Distance::ElementType = float]’
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:884:1:   required from here
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:666:39: error: call of overloaded ‘abs(flann::KDTreeIndex<flann::MinkowskiDistance<float> >::ElementType)’ is ambiguous
                 ElementType span = abs(point[i]-leaf_point[i]);
                                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:75:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/include/stdlib.h:774:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:185:3: note: candidate: __int128 std::abs(__int128)
   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:180:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:172:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
In file included from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/all_indices.h:36:0,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:45,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h: In instantiation of ‘void flann::KDTreeIndex<Distance>::addPointToTree(flann::KDTreeIndex<Distance>::NodePtr, int) [with Distance = flann::L1<float>; flann::KDTreeIndex<Distance>::NodePtr = flann::KDTreeIndex<flann::L1<float> >::Node*]’:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:154:35:   required from ‘void flann::KDTreeIndex<Distance>::addPoints(const flann::Matrix<typename Distance::ElementType>&, float) [with Distance = flann::L1<float>; typename Distance::ElementType = float]’
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:884:1:   required from here
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:666:39: error: call of overloaded ‘abs(flann::KDTreeIndex<flann::L1<float> >::ElementType)’ is ambiguous
                 ElementType span = abs(point[i]-leaf_point[i]);
                                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:75:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/include/stdlib.h:774:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:185:3: note: candidate: __int128 std::abs(__int128)
   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:180:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:172:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
In file included from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/all_indices.h:36:0,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:45,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h: In instantiation of ‘void flann::KDTreeIndex<Distance>::addPointToTree(flann::KDTreeIndex<Distance>::NodePtr, int) [with Distance = flann::L2<float>; flann::KDTreeIndex<Distance>::NodePtr = flann::KDTreeIndex<flann::L2<float> >::Node*]’:
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:154:35:   required from ‘void flann::KDTreeIndex<Distance>::addPoints(const flann::Matrix<typename Distance::ElementType>&, float) [with Distance = flann::L2<float>; typename Distance::ElementType = float]’
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:884:1:   required from here
/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/algorithms/kdtree_index.h:666:39: error: call of overloaded ‘abs(flann::KDTreeIndex<flann::L2<float> >::ElementType)’ is ambiguous
                 ElementType span = abs(point[i]-leaf_point[i]);
                                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:75:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/include/stdlib.h:774:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/ext/string_conversions.h:41:0,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/bits/basic_string.h:5402,
                 from /usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/string:52,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.hpp:36,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.h:466,
                 from /var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src/src/cpp/flann/flann.cpp:31:
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:185:3: note: candidate: __int128 std::abs(__int128)
   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:180:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/lib/gcc/x86_64-pc-linux-gnu/6.2.0/include/g++-v6/cstdlib:172:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
make[2]: *** [src/cpp/CMakeFiles/flann_s.dir/build.make:63: src/cpp/CMakeFiles/flann_s.dir/flann/flann.cpp.o] Error 1
make[2]: Leaving directory '/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build'
make[1]: *** [CMakeFiles/Makefile2:271: src/cpp/CMakeFiles/flann_s.dir/all] Error 2
make[1]: Leaving directory '/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build'
make: *** [Makefile:150: all] Error 2
 * ERROR: sci-libs/flann-1.8.4-r1::gentoo failed (compile phase):
 *   emake failed
 * 
 * If you need support, post the output of `emerge --info '=sci-libs/flann-1.8.4-r1::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=sci-libs/flann-1.8.4-r1::gentoo'`.
 * The complete build log is located at '/var/log/portage/sci-libs:flann-1.8.4-r1:20160915-051709.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/sci-libs/flann-1.8.4-r1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/sci-libs/flann-1.8.4-r1/temp/environment'.
 * Working directory: '/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4_build'
 * S: '/var/tmp/portage/sci-libs/flann-1.8.4-r1/work/flann-1.8.4-src'