Determining if the pthread_create exist failed with the following output:
Change Dir: /home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_b649d/fast"
make[1]: Entering directory '/home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_b649d.dir/build.make CMakeFiles/cmTC_b649d.dir/build
make[2]: Entering directory '/home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_b649d.dir/CheckSymbolExists.c.o
/home/buildroot/autobuild/instance-2/output-1/host/bin/x86_64-amd-linux-gnu-gcc --sysroot=/home/buildroot/autobuild/instance-2/output-1/host/x86_64-buildroot-linux-gnu/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os   -DNDEBUG   -o CMakeFiles/cmTC_b649d.dir/CheckSymbolExists.c.o   -c /home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp/CheckSymbolExists.c
Linking C executable cmTC_b649d
/home/buildroot/autobuild/instance-2/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_b649d.dir/link.txt --verbose=1
/home/buildroot/autobuild/instance-2/output-1/host/bin/x86_64-amd-linux-gnu-gcc --sysroot=/home/buildroot/autobuild/instance-2/output-1/host/x86_64-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os   -DNDEBUG    -rdynamic CMakeFiles/cmTC_b649d.dir/CheckSymbolExists.c.o  -o cmTC_b649d 
CMakeFiles/cmTC_b649d.dir/CheckSymbolExists.c.o: In function `main':
CheckSymbolExists.c:(.text.startup+0x6): undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_b649d.dir/build.make:97: recipe for target 'cmTC_b649d' failed
make[2]: *** [cmTC_b649d] Error 1
make[2]: Leaving directory '/home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_b649d/fast' failed
make[1]: *** [cmTC_b649d/fast] Error 2
make[1]: Leaving directory '/home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp'

File /home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/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 compiler accepts -pthread returned PLEASE_FILL_OUT-FAILED_TO_RUN instead of 2. The compiler had the following output:
Change Dir: /home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_a6deb/fast"
make[1]: Entering directory '/home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_a6deb.dir/build.make CMakeFiles/cmTC_a6deb.dir/build
make[2]: Entering directory '/home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_a6deb.dir/CheckForPthreads.c.o
/home/buildroot/autobuild/instance-2/output-1/host/bin/x86_64-amd-linux-gnu-gcc --sysroot=/home/buildroot/autobuild/instance-2/output-1/host/x86_64-buildroot-linux-gnu/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os   -DNDEBUG   -o CMakeFiles/cmTC_a6deb.dir/CheckForPthreads.c.o   -c /home/buildroot/autobuild/instance-2/output-1/host/share/cmake-3.8/Modules/CheckForPthreads.c
Linking C executable cmTC_a6deb
/home/buildroot/autobuild/instance-2/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_a6deb.dir/link.txt --verbose=1
/home/buildroot/autobuild/instance-2/output-1/host/bin/x86_64-amd-linux-gnu-gcc --sysroot=/home/buildroot/autobuild/instance-2/output-1/host/x86_64-buildroot-linux-gnu/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os   -DNDEBUG    -rdynamic CMakeFiles/cmTC_a6deb.dir/CheckForPthreads.c.o  -o cmTC_a6deb -pthread 
make[2]: Leaving directory '/home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp'
make[1]: Leaving directory '/home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp'


Determining if the getpassphrase exist failed with the following output:
Change Dir: /home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_d3f01/fast"
make[1]: Entering directory '/home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_d3f01.dir/build.make CMakeFiles/cmTC_d3f01.dir/build
make[2]: Entering directory '/home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_d3f01.dir/CheckSymbolExists.cxx.o
/home/buildroot/autobuild/instance-2/output-1/host/bin/x86_64-amd-linux-gnu-g++ --sysroot=/home/buildroot/autobuild/instance-2/output-1/host/x86_64-buildroot-linux-gnu/sysroot    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os   -DNDEBUG   -o CMakeFiles/cmTC_d3f01.dir/CheckSymbolExists.cxx.o -c /home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx
/home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx: In function 'int main(int, char**)':
/home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx:8:19: error: 'getpassphrase' was not declared in this scope
   return ((int*)(&getpassphrase))[argc];
                   ^~~~~~~~~~~~~
CMakeFiles/cmTC_d3f01.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_d3f01.dir/CheckSymbolExists.cxx.o' failed
make[2]: *** [CMakeFiles/cmTC_d3f01.dir/CheckSymbolExists.cxx.o] Error 1
make[2]: Leaving directory '/home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_d3f01/fast' failed
make[1]: *** [cmTC_d3f01/fast] Error 2
make[1]: Leaving directory '/home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp'

File /home/buildroot/autobuild/instance-2/output-1/build/znc-1.7.5/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx:
/* */
#include <stdlib.h>

int main(int argc, char** argv)
{
  (void)argv;
#ifndef getpassphrase
  return ((int*)(&getpassphrase))[argc];
#else
  (void)argc;
  return 0;
#endif
}