Build output check failed:
    Regex: 'command line option .* is valid for .* but not for C\+\+'
    Output line: 'cc1plus: warning: command line option ‘-Wmissing-prototypes’ is valid for C/ObjC but not for C++'
Compilation failed:
    source file: '/var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp/src.cxx'
    check option: ' -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations  -Wmissing-prototypes'
===== BUILD LOG =====
Change Dir: /var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_a4b85 
[1/2] Building CXX object CMakeFiles/cmTC_a4b85.dir/src.cxx.o
cc1plus: warning: command line option ‘-Wmissing-prototypes’ is valid for C/ObjC but not for C++
src.cxx:1: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
[2/2] Linking CXX executable cmTC_a4b85

===== END =====

Build output check failed:
    Regex: 'command line option .* is valid for .* but not for C\+\+'
    Output line: 'cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++'
Compilation failed:
    source file: '/var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp/src.cxx'
    check option: ' -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations  -Wstrict-prototypes'
===== BUILD LOG =====
Change Dir: /var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_1da1b 
[1/2] Building CXX object CMakeFiles/cmTC_1da1b.dir/src.cxx.o
cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++
src.cxx:1: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
[2/2] Linking CXX executable cmTC_1da1b

===== END =====

Build output check failed:
    Regex: 'command line option .* is valid for .* but not for C'
    Output line: 'cc1: warning: command line option ‘-Wsign-promo’ is valid for C++/ObjC++ but not for C'
Compilation failed:
    source file: '/var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp/src.c'
    check option: ' -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow  -Wsign-promo'
===== BUILD LOG =====
Change Dir: /var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_1580d 
[1/2] Building C object CMakeFiles/cmTC_1580d.dir/src.c.o
cc1: warning: command line option ‘-Wsign-promo’ is valid for C++/ObjC++ but not for C
src.c:1: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
[2/2] Linking C executable cmTC_1580d

===== END =====

Build output check failed:
    Regex: 'command line option .* is valid for .* but not for C'
    Output line: 'cc1: warning: command line option ‘-Wno-delete-non-virtual-dtor’ is valid for C++/ObjC++ but not for C'
Compilation failed:
    source file: '/var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp/src.c'
    check option: ' -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing  -Wno-delete-non-virtual-dtor'
===== BUILD LOG =====
Change Dir: /var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_85746 
[1/2] Building C object CMakeFiles/cmTC_85746.dir/src.c.o
cc1: warning: command line option ‘-Wno-delete-non-virtual-dtor’ is valid for C++/ObjC++ but not for C
src.c:1: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
[2/2] Linking C executable cmTC_85746

===== END =====

Build output check failed:
    Regex: 'unrecognized .*option'
    Output line: 'cc1plus: warning: unrecognized command line option ‘-Wno-unnamed-type-template-args’'
Compilation failed:
    source file: '/var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp/src.cxx'
    check option: ' -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor  -Wno-unnamed-type-template-args'
===== BUILD LOG =====
Change Dir: /var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_abedb 
[1/2] Building CXX object CMakeFiles/cmTC_abedb.dir/src.cxx.o
src.cxx:1: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
cc1plus: warning: unrecognized command line option ‘-Wno-unnamed-type-template-args’
[2/2] Linking CXX executable cmTC_abedb

===== END =====

Build output check failed:
    Regex: 'unrecognized .*option'
    Output line: 'cc1: warning: unrecognized command line option ‘-Wno-unnamed-type-template-args’'
Compilation failed:
    source file: '/var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp/src.c'
    check option: ' -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing  -Wno-unnamed-type-template-args'
===== BUILD LOG =====
Change Dir: /var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_77287 
[1/2] Building C object CMakeFiles/cmTC_77287.dir/src.c.o
src.c:1: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
cc1: warning: unrecognized command line option ‘-Wno-unnamed-type-template-args’
[2/2] Linking C executable cmTC_77287

===== END =====

Compilation failed:
    source file: '/var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1/cmake/checks/cpu_avx512.cpp'
    check option: ' -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -mf16c -mfma -mavx -mavx2'
===== BUILD LOG =====
Change Dir: /var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_43bf6 
[1/2] Building CXX object CMakeFiles/cmTC_43bf6.dir/cpu_avx512.cpp.o
FAILED: CMakeFiles/cmTC_43bf6.dir/cpu_avx512.cpp.o 
/usr/bin/x86_64-pc-linux-gnu-g++    -DNDEBUG -march=native -O2 -pipe  -fPIE    -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -mf16c -mfma -mavx -mavx2 -o CMakeFiles/cmTC_43bf6.dir/cpu_avx512.cpp.o -c /var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1/cmake/checks/cpu_avx512.cpp
/var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1/cmake/checks/cpu_avx512.cpp:8:2: error: #error "AVX512 is not supported"
 #error "AVX512 is not supported"
  ^~~~~
ninja: build stopped: subcommand failed.

===== END =====

Compilation failed:
    source file: '/var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1/cmake/checks/cpu_avx512skx.cpp'
    check option: ' -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -mf16c -mfma -mavx -mavx2'
===== BUILD LOG =====
Change Dir: /var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_974af 
[1/2] Building CXX object CMakeFiles/cmTC_974af.dir/cpu_avx512skx.cpp.o
FAILED: CMakeFiles/cmTC_974af.dir/cpu_avx512skx.cpp.o 
/usr/bin/x86_64-pc-linux-gnu-g++    -DNDEBUG -march=native -O2 -pipe  -fPIE    -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -mf16c -mfma -mavx -mavx2 -o CMakeFiles/cmTC_974af.dir/cpu_avx512skx.cpp.o -c /var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1/cmake/checks/cpu_avx512skx.cpp
/var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1/cmake/checks/cpu_avx512skx.cpp:12:2: error: #error "AVX512-SKX is not supported"
 #error "AVX512-SKX is not supported"
  ^~~~~
ninja: build stopped: subcommand failed.

===== END =====

Build output check failed:
    Regex: 'command line option .* is valid for .* but not for C'
    Output line: 'cc1: warning: command line option ‘-fvisibility-inlines-hidden’ is valid for C++/ObjC++ but not for C'
Compilation failed:
    source file: '/var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp/src.c'
    check option: ' -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wno-implicit-fallthrough -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -mf16c -mfma -mavx -mavx2 -fvisibility=hidden  -fvisibility-inlines-hidden'
===== BUILD LOG =====
Change Dir: /var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_ca23f 
[1/2] Building C object CMakeFiles/cmTC_ca23f.dir/src.c.o
cc1: warning: command line option ‘-fvisibility-inlines-hidden’ is valid for C++/ObjC++ but not for C
src.c:1: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
[2/2] Linking C executable cmTC_ca23f

===== END =====

Determining if the include file /usr/include/libpng/png.h exists failed with the following output:
Change Dir: /var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_93250 
[1/2] Building C object CMakeFiles/cmTC_93250.dir/CheckIncludeFile.c.o
FAILED: CMakeFiles/cmTC_93250.dir/CheckIncludeFile.c.o 
/usr/bin/x86_64-pc-linux-gnu-gcc    -DNDEBUG -march=native -O2 -pipe   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wno-implicit-fallthrough -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -mf16c -mfma -mavx -mavx2 -fvisibility=hidden  -fPIE -o CMakeFiles/cmTC_93250.dir/CheckIncludeFile.c.o -c CheckIncludeFile.c
CheckIncludeFile.c:1:10: fatal error: /usr/include/libpng/png.h: No such file or directory
 #include </usr/include/libpng/png.h>
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
ninja: build stopped: subcommand failed.


Determining if the include file linux/videodev.h exists failed with the following output:
Change Dir: /var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_d2855 
[1/2] Building C object CMakeFiles/cmTC_d2855.dir/CheckIncludeFile.c.o
FAILED: CMakeFiles/cmTC_d2855.dir/CheckIncludeFile.c.o 
/usr/bin/x86_64-pc-linux-gnu-gcc    -DNDEBUG -march=native -O2 -pipe   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wno-implicit-fallthrough -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -mf16c -mfma -mavx -mavx2 -fvisibility=hidden  -fPIE -o CMakeFiles/cmTC_d2855.dir/CheckIncludeFile.c.o -c CheckIncludeFile.c
CheckIncludeFile.c:1:10: fatal error: linux/videodev.h: No such file or directory
 #include <linux/videodev.h>
          ^~~~~~~~~~~~~~~~~~
compilation terminated.
ninja: build stopped: subcommand failed.


Determining if the include file sys/videoio.h exists failed with the following output:
Change Dir: /var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_6cd70 
[1/2] Building C object CMakeFiles/cmTC_6cd70.dir/CheckIncludeFile.c.o
FAILED: CMakeFiles/cmTC_6cd70.dir/CheckIncludeFile.c.o 
/usr/bin/x86_64-pc-linux-gnu-gcc    -DNDEBUG -march=native -O2 -pipe   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wno-implicit-fallthrough -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -mf16c -mfma -mavx -mavx2 -fvisibility=hidden  -fPIE -o CMakeFiles/cmTC_6cd70.dir/CheckIncludeFile.c.o -c CheckIncludeFile.c
CheckIncludeFile.c:1:10: fatal error: sys/videoio.h: No such file or directory
 #include <sys/videoio.h>
          ^~~~~~~~~~~~~~~
compilation terminated.
ninja: build stopped: subcommand failed.


Build output check failed:
    Regex: 'command line option .* is valid for .* but not for C\+\+'
    Output line: 'cc1plus: warning: command line option ‘-Wno-missing-prototypes’ is valid for C/ObjC but not for C++'
Compilation failed:
    source file: '/var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp/src.cxx'
    check option: ' -Wno-missing-prototypes'
===== BUILD LOG =====
Change Dir: /var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_56f1e 
[1/2] Building CXX object CMakeFiles/cmTC_56f1e.dir/src.cxx.o
cc1plus: warning: command line option ‘-Wno-missing-prototypes’ is valid for C/ObjC but not for C++
src.cxx:1: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
[2/2] Linking CXX executable cmTC_56f1e

===== END =====

Build output check failed:
    Regex: 'unrecognized .*option'
    Output line: 'cc1plus: warning: unrecognized command line option ‘-Wno-tautological-undefined-compare’'
Compilation failed:
    source file: '/var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp/src.cxx'
    check option: ' -Wno-tautological-undefined-compare'
===== BUILD LOG =====
Change Dir: /var/tmp/portage/media-libs/opencv-3.4.1-r5/work/opencv-3.4.1-abi_x86_64.amd64/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_a95f9 
[1/2] Building CXX object CMakeFiles/cmTC_a95f9.dir/src.cxx.o
src.cxx:1: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
cc1plus: warning: unrecognized command line option ‘-Wno-tautological-undefined-compare’
[2/2] Linking CXX executable cmTC_a95f9

===== END =====