Determining if the pthread_create exist failed with the following output: Change Dir: /tmp/tmp.55FUdkWZ0x/cmake-build-debug/CMakeFiles/CMakeTmp Run Build Command:"/usr/bin/make" "cmTC_34056/fast" /usr/bin/make -f CMakeFiles/cmTC_34056.dir/build.make CMakeFiles/cmTC_34056.dir/build make[1]: Entering directory '/tmp/tmp.55FUdkWZ0x/cmake-build-debug/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_34056.dir/CheckSymbolExists.c.o /usr/bin/cc -o CMakeFiles/cmTC_34056.dir/CheckSymbolExists.c.o -c /tmp/tmp.55FUdkWZ0x/cmake-build-debug/CMakeFiles/CMakeTmp/CheckSymbolExists.c Linking C executable cmTC_34056 /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_34056.dir/link.txt --verbose=1 /usr/bin/cc CMakeFiles/cmTC_34056.dir/CheckSymbolExists.c.o -o cmTC_34056 /usr/bin/ld: CMakeFiles/cmTC_34056.dir/CheckSymbolExists.c.o: in function `main': CheckSymbolExists.c:(.text+0x1b): undefined reference to `pthread_create' collect2: error: ld returned 1 exit status CMakeFiles/cmTC_34056.dir/build.make:86: recipe for target 'cmTC_34056' failed make[1]: *** [cmTC_34056] Error 1 make[1]: Leaving directory '/tmp/tmp.55FUdkWZ0x/cmake-build-debug/CMakeFiles/CMakeTmp' Makefile:121: recipe for target 'cmTC_34056/fast' failed make: *** [cmTC_34056/fast] Error 2 File /tmp/tmp.55FUdkWZ0x/cmake-build-debug/CMakeFiles/CMakeTmp/CheckSymbolExists.c: /* */ #include int main(int argc, char** argv) { (void)argv; #ifndef pthread_create return ((int*)(&pthread_create))[argc]; #else (void)argc; return 0; #endif } Determining if the function pthread_create exists in the pthreads failed with the following output: Change Dir: /tmp/tmp.55FUdkWZ0x/cmake-build-debug/CMakeFiles/CMakeTmp Run Build Command:"/usr/bin/make" "cmTC_f5618/fast" /usr/bin/make -f CMakeFiles/cmTC_f5618.dir/build.make CMakeFiles/cmTC_f5618.dir/build make[1]: Entering directory '/tmp/tmp.55FUdkWZ0x/cmake-build-debug/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_f5618.dir/CheckFunctionExists.c.o /usr/bin/cc -DCHECK_FUNCTION_EXISTS=pthread_create -o CMakeFiles/cmTC_f5618.dir/CheckFunctionExists.c.o -c /usr/share/cmake-3.13/Modules/CheckFunctionExists.c Linking C executable cmTC_f5618 /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_f5618.dir/link.txt --verbose=1 /usr/bin/cc -DCHECK_FUNCTION_EXISTS=pthread_create CMakeFiles/cmTC_f5618.dir/CheckFunctionExists.c.o -o cmTC_f5618 -lpthreads /usr/bin/ld: cannot find -lpthreads collect2: error: ld returned 1 exit status CMakeFiles/cmTC_f5618.dir/build.make:86: recipe for target 'cmTC_f5618' failed make[1]: *** [cmTC_f5618] Error 1 make[1]: Leaving directory '/tmp/tmp.55FUdkWZ0x/cmake-build-debug/CMakeFiles/CMakeTmp' Makefile:121: recipe for target 'cmTC_f5618/fast' failed make: *** [cmTC_f5618/fast] Error 2