In other projects I get similar error except that the missing library is something else ( -lSystem, for example).

usr/bin/clang -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/atform/Developer/SDKs/MacOSX11.1.sdk -Wl,-search_paths_first -Wl,-headerpad_max_install_names -static CMakeFiles/cmTC_b5a37.dir/testCCompiler.c.o -o cmTC_b5a37Ĭlang: error: linker command failed with exit code 1 (use -v to see invocation) usr/bin/clang -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/atform/Developer/SDKs/MacOSX11.1.sdk -o CMakeFiles/cmTC_b5a37.dir/testCCompiler.c.o -c /Users/harniver/Git/aggregate/fcpp/fcpp/bin/CMakeFiles/CMakeTmp/testCCompiler.c Is not able to compile a simple test program. Check for working C compiler: /usr/bin/clang - brokenĬMake Error at /usr/local/Cellar/cmake/3.19.3/share/cmake/Modules/CMakeTestCCompiler.cmake:66 (message): Check for working C compiler: /usr/bin/clang The CXX compiler identification is AppleClang 12.0032 bin -G 'Unix Makefiles' i get the output: - The C compiler identification is AppleClang 12.0032 I re-installed the command line tools ( xcode-select -install) and updated cmake ( brew upgrade cmake). After updating to Big Sur, I am unable to compile anything with cmake.

Update xcode command line