Determining if the pthread_create exist failed with the following output:
Change Dir: /tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_5c527/fast"
make[1]: Entering directory '/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_5c527.dir/build.make CMakeFiles/cmTC_5c527.dir/build
make[2]: Entering directory '/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_5c527.dir/CheckSymbolExists.c.o
/tmp/instance-3/output-1/host/bin/arm-linux-gnueabihf-gcc --sysroot=/tmp/instance-3/output-1/host/arm-buildroot-linux-gnueabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os   -DNDEBUG   -o CMakeFiles/cmTC_5c527.dir/CheckSymbolExists.c.o   -c /tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp/CheckSymbolExists.c
Linking C executable cmTC_5c527
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_5c527.dir/link.txt --verbose=1
/tmp/instance-3/output-1/host/bin/arm-linux-gnueabihf-gcc --sysroot=/tmp/instance-3/output-1/host/arm-buildroot-linux-gnueabihf/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os   -DNDEBUG    CMakeFiles/cmTC_5c527.dir/CheckSymbolExists.c.o  -o cmTC_5c527 
CMakeFiles/cmTC_5c527.dir/CheckSymbolExists.c.o: In function `main':
CheckSymbolExists.c:(.text.startup+0x1c): undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/cmTC_5c527.dir/build.make:87: cmTC_5c527] Error 1
make[2]: Leaving directory '/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: *** [Makefile:121: cmTC_5c527/fast] Error 2
make[1]: Leaving directory '/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp'

File /tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-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: /tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_fd263/fast"
make[1]: Entering directory '/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_fd263.dir/build.make CMakeFiles/cmTC_fd263.dir/build
make[2]: Entering directory '/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_fd263.dir/CheckFunctionExists.c.o
/tmp/instance-3/output-1/host/bin/arm-linux-gnueabihf-gcc --sysroot=/tmp/instance-3/output-1/host/arm-buildroot-linux-gnueabihf/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCHECK_FUNCTION_EXISTS=pthread_create  -DNDEBUG   -o CMakeFiles/cmTC_fd263.dir/CheckFunctionExists.c.o   -c /usr/share/cmake-3.13/Modules/CheckFunctionExists.c
Linking C executable cmTC_fd263
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_fd263.dir/link.txt --verbose=1
/tmp/instance-3/output-1/host/bin/arm-linux-gnueabihf-gcc --sysroot=/tmp/instance-3/output-1/host/arm-buildroot-linux-gnueabihf/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCHECK_FUNCTION_EXISTS=pthread_create  -DNDEBUG    CMakeFiles/cmTC_fd263.dir/CheckFunctionExists.c.o  -o cmTC_fd263 -lpthreads 
/tmp/instance-3/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-linux-gnueabihf/7.3.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lpthreads
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/cmTC_fd263.dir/build.make:87: cmTC_fd263] Error 1
make[2]: Leaving directory '/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: *** [Makefile:121: cmTC_fd263/fast] Error 2
make[1]: Leaving directory '/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp'


Performing C++ SOURCE FILE Test HAVE_MACH_ABSOLUTE_TIME failed with the following output:
Change Dir: /tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_20314/fast"
make[1]: Entering directory '/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_20314.dir/build.make CMakeFiles/cmTC_20314.dir/build
make[2]: Entering directory '/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_20314.dir/src.cxx.o
/tmp/instance-3/output-1/host/bin/arm-linux-gnueabihf-g++ --sysroot=/tmp/instance-3/output-1/host/arm-buildroot-linux-gnueabihf/sysroot    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DHAVE_MACH_ABSOLUTE_TIME  -DNDEBUG   -std=gnu++11 -o CMakeFiles/cmTC_20314.dir/src.cxx.o -c /tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp/src.cxx
/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-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.
make[2]: *** [CMakeFiles/cmTC_20314.dir/build.make:66: CMakeFiles/cmTC_20314.dir/src.cxx.o] Error 1
make[2]: Leaving directory '/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: *** [Makefile:121: cmTC_20314/fast] Error 2
make[1]: Leaving directory '/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp'

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: /tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_0fab3/fast"
make[1]: Entering directory '/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_0fab3.dir/build.make CMakeFiles/cmTC_0fab3.dir/build
make[2]: Entering directory '/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_0fab3.dir/src.cxx.o
/tmp/instance-3/output-1/host/bin/arm-linux-gnueabihf-g++ --sysroot=/tmp/instance-3/output-1/host/arm-buildroot-linux-gnueabihf/sysroot    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DHAVE_QUERY_PERFORMANCE_COUNTER  -DNDEBUG   -std=gnu++11 -o CMakeFiles/cmTC_0fab3.dir/src.cxx.o -c /tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp/src.cxx
/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp/src.cxx:2:14: fatal error: Windows.h: No such file or directory
     #include <Windows.h>
              ^~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/cmTC_0fab3.dir/build.make:66: CMakeFiles/cmTC_0fab3.dir/src.cxx.o] Error 1
make[2]: Leaving directory '/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp'
make[1]: *** [Makefile:121: cmTC_0fab3/fast] Error 2
make[1]: Leaving directory '/tmp/instance-3/output-1/build/gr-osmosdr-0.2.0/buildroot-build/CMakeFiles/CMakeTmp'

Source file was:

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