Determining if the pthread_create exist failed with the following output:
Change Dir: /home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_06c5d/fast"
/usr/bin/make -f CMakeFiles/cmTC_06c5d.dir/build.make CMakeFiles/cmTC_06c5d.dir/build
make[1]: Entering directory '/home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_06c5d.dir/CheckSymbolExists.c.o
/usr/bin/cc    -o CMakeFiles/cmTC_06c5d.dir/CheckSymbolExists.c.o   -c /home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp/CheckSymbolExists.c
Linking C executable cmTC_06c5d
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_06c5d.dir/link.txt --verbose=1
/usr/bin/cc      CMakeFiles/cmTC_06c5d.dir/CheckSymbolExists.c.o  -o cmTC_06c5d
CMakeFiles/cmTC_06c5d.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_06c5d.dir/build.make:97: recipe for target 'cmTC_06c5d' failed
make[1]: *** [cmTC_06c5d] Error 1
make[1]: Leaving directory '/home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_06c5d/fast' failed
make: *** [cmTC_06c5d/fast] Error 2

File /home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
/* */
#include <pthread.h>

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: /home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_57668/fast"
/usr/bin/make -f CMakeFiles/cmTC_57668.dir/build.make CMakeFiles/cmTC_57668.dir/build
make[1]: Entering directory '/home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_57668.dir/CheckFunctionExists.c.o
/usr/bin/cc   -DCHECK_FUNCTION_EXISTS=pthread_create   -o CMakeFiles/cmTC_57668.dir/CheckFunctionExists.c.o   -c /usr/share/cmake-3.10/Modules/CheckFunctionExists.c
Linking C executable cmTC_57668
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_57668.dir/link.txt --verbose=1
/usr/bin/cc  -DCHECK_FUNCTION_EXISTS=pthread_create    CMakeFiles/cmTC_57668.dir/CheckFunctionExists.c.o  -o cmTC_57668 -lpthreads
/usr/bin/ld: cannot find -lpthreads
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_57668.dir/build.make:97: recipe for target 'cmTC_57668' failed
make[1]: *** [cmTC_57668] Error 1
make[1]: Leaving directory '/home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_57668/fast' failed
make: *** [cmTC_57668/fast] Error 2


Performing C++ SOURCE FILE Test HAVE_MACH_ABSOLUTE_TIME failed with the following output:
Change Dir: /home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_26b96/fast"
/usr/bin/make -f CMakeFiles/cmTC_26b96.dir/build.make CMakeFiles/cmTC_26b96.dir/build
make[1]: Entering directory '/home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_26b96.dir/src.cxx.o
/usr/bin/c++    -DHAVE_MACH_ABSOLUTE_TIME   -std=gnu++11 -o CMakeFiles/cmTC_26b96.dir/src.cxx.o -c /home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp/src.cxx
/home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp/src.cxx:2:14: fatal error: mach/mach_time.h: No such file or directory
     #include <mach/mach_time.h>
              ^~~~~~~~~~~~~~~~~~
compilation terminated.
CMakeFiles/cmTC_26b96.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_26b96.dir/src.cxx.o' failed
make[1]: *** [CMakeFiles/cmTC_26b96.dir/src.cxx.o] Error 1
make[1]: Leaving directory '/home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_26b96/fast' failed
make: *** [cmTC_26b96/fast] Error 2

Source file was:

    #include <mach/mach_time.h>
    int main(){
        mach_timebase_info_data_t info;
        mach_timebase_info(&info);
        mach_absolute_time();
        return 0;
    }

Performing C++ SOURCE FILE Test HAVE_QUERY_PERFORMANCE_COUNTER failed with the following output:
Change Dir: /home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_c63b2/fast"
/usr/bin/make -f CMakeFiles/cmTC_c63b2.dir/build.make CMakeFiles/cmTC_c63b2.dir/build
make[1]: Entering directory '/home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_c63b2.dir/src.cxx.o
/usr/bin/c++    -DHAVE_QUERY_PERFORMANCE_COUNTER   -std=gnu++11 -o CMakeFiles/cmTC_c63b2.dir/src.cxx.o -c /home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp/src.cxx
/home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp/src.cxx:2:14: fatal error: Windows.h: No such file or directory
     #include <Windows.h>
              ^~~~~~~~~~~
compilation terminated.
CMakeFiles/cmTC_c63b2.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_c63b2.dir/src.cxx.o' failed
make[1]: *** [CMakeFiles/cmTC_c63b2.dir/src.cxx.o] Error 1
make[1]: Leaving directory '/home/flash/repos/gr-osmosdr/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_c63b2/fast' failed
make: *** [cmTC_c63b2/fast] Error 2

Source file was:

    #include <Windows.h>
    int main(){
        LARGE_INTEGER value;
        QueryPerformanceCounter(&value);
        QueryPerformanceFrequency(&value);
        return 0;
    }