Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output:
Change Dir: /usr/local/src/build-dir/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake cmTC_9b91d/fast && /usr/bin/gmake  -f CMakeFiles/cmTC_9b91d.dir/build.make CMakeFiles/cmTC_9b91d.dir/build
gmake[1]: Entering directory `/usr/local/src/build-dir/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_9b91d.dir/src.c.o
/usr/bin/cc   -DCMAKE_HAVE_LIBC_PTHREAD   -std=gnu99 -o CMakeFiles/cmTC_9b91d.dir/src.c.o   -c /usr/local/src/build-dir/CMakeFiles/CMakeTmp/src.c
Linking C executable cmTC_9b91d
/usr/bin/cmake3 -E cmake_link_script CMakeFiles/cmTC_9b91d.dir/link.txt --verbose=1
/usr/bin/cc  -DCMAKE_HAVE_LIBC_PTHREAD    CMakeFiles/cmTC_9b91d.dir/src.c.o  -o cmTC_9b91d 
CMakeFiles/cmTC_9b91d.dir/src.c.o: In function `main':
src.c:(.text+0x2d): undefined reference to `pthread_create'
src.c:(.text+0x39): undefined reference to `pthread_detach'
src.c:(.text+0x45): undefined reference to `pthread_cancel'
src.c:(.text+0x56): undefined reference to `pthread_join'
src.c:(.text+0x6a): undefined reference to `pthread_atfork'
collect2: error: ld returned 1 exit status
gmake[1]: *** [cmTC_9b91d] Error 1
gmake[1]: Leaving directory `/usr/local/src/build-dir/CMakeFiles/CMakeTmp'
gmake: *** [cmTC_9b91d/fast] Error 2


Source file was:
#include <pthread.h>

void* test_func(void* data)
{
  return data;
}

int main(void)
{
  pthread_t thread;
  pthread_create(&thread, NULL, test_func, NULL);
  pthread_detach(thread);
  pthread_cancel(thread);
  pthread_join(thread, NULL);
  pthread_atfork(NULL, NULL, NULL);
  pthread_exit(NULL);

  return 0;
}