The system is: Linux - 4.19.174-gentoo - x86_64 Compiling the C compiler identification source file "CMakeCCompilerId.c" succeeded. Compiler: /usr/lib/llvm/13/bin/x86_64-pc-linux-gnu-clang Build flags: -O2;-pipe;-march=x86-64;-frecord-gcc-switches;-fno-diagnostics-color;-fmessage-length=0 Id flags: The output was: 0 Compilation of the C compiler identification source "CMakeCCompilerId.c" produced "a.out" The C compiler identification is Clang, found in "/var/tmp/portage/sci-biology/uchime-4.2.40/work/uchime-4.2.40_build/CMakeFiles/3.22.1/CompilerIdC/a.out" Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" succeeded. Compiler: /usr/lib/llvm/13/bin/x86_64-pc-linux-gnu-clang++ Build flags: -O2;-pipe;-march=x86-64;-frecord-gcc-switches;-fno-diagnostics-color;-fmessage-length=0 Id flags: The output was: 0 Compilation of the CXX compiler identification source "CMakeCXXCompilerId.cpp" produced "a.out" The CXX compiler identification is Clang, found in "/var/tmp/portage/sci-biology/uchime-4.2.40/work/uchime-4.2.40_build/CMakeFiles/3.22.1/CompilerIdCXX/a.out"