Determining if the pthread_create exist failed with the following output:
Change Dir: /home/rob/indi-code/3rdparty/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTryCompileExec286618455/fast"
/usr/bin/make -f CMakeFiles/cmTryCompileExec286618455.dir/build.make CMakeFiles/cmTryCompileExec286618455.dir/build
make[1]: Entering directory '/home/rob/indi-code/3rdparty/CMakeFiles/CMakeTmp'
/usr/bin/cmake -E cmake_progress_report /home/rob/indi-code/3rdparty/CMakeFiles/CMakeTmp/CMakeFiles 1
Building C object CMakeFiles/cmTryCompileExec286618455.dir/CheckSymbolExists.c.o
/usr/bin/cc   -I/usr/include/libusb-1.0    -o CMakeFiles/cmTryCompileExec286618455.dir/CheckSymbolExists.c.o   -c /home/rob/indi-code/3rdparty/CMakeFiles/CMakeTmp/CheckSymbolExists.c
Linking C executable cmTryCompileExec286618455
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTryCompileExec286618455.dir/link.txt --verbose=1
/usr/bin/cc       CMakeFiles/cmTryCompileExec286618455.dir/CheckSymbolExists.c.o  -o cmTryCompileExec286618455 -rdynamic -lusb-1.0 
/usr/bin/ld: CMakeFiles/cmTryCompileExec286618455.dir/CheckSymbolExists.c.o: undefined reference to symbol 'pthread_create@@GLIBC_2.4'
/usr/lib/libpthread.so.0: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
CMakeFiles/cmTryCompileExec286618455.dir/build.make:89: recipe for target 'cmTryCompileExec286618455' failed
make[1]: *** [cmTryCompileExec286618455] Error 1
make[1]: Leaving directory '/home/rob/indi-code/3rdparty/CMakeFiles/CMakeTmp'
Makefile:117: recipe for target 'cmTryCompileExec286618455/fast' failed
make: *** [cmTryCompileExec286618455/fast] Error 2

File /home/rob/indi-code/3rdparty/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/rob/indi-code/3rdparty/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTryCompileExec2608520401/fast"
/usr/bin/make -f CMakeFiles/cmTryCompileExec2608520401.dir/build.make CMakeFiles/cmTryCompileExec2608520401.dir/build
make[1]: Entering directory '/home/rob/indi-code/3rdparty/CMakeFiles/CMakeTmp'
/usr/bin/cmake -E cmake_progress_report /home/rob/indi-code/3rdparty/CMakeFiles/CMakeTmp/CMakeFiles 1
Building C object CMakeFiles/cmTryCompileExec2608520401.dir/CheckFunctionExists.c.o
/usr/bin/cc   -DCHECK_FUNCTION_EXISTS=pthread_create   -o CMakeFiles/cmTryCompileExec2608520401.dir/CheckFunctionExists.c.o   -c /usr/share/cmake-3.2/Modules/CheckFunctionExists.c
Linking C executable cmTryCompileExec2608520401
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTryCompileExec2608520401.dir/link.txt --verbose=1
/usr/bin/cc   -DCHECK_FUNCTION_EXISTS=pthread_create    CMakeFiles/cmTryCompileExec2608520401.dir/CheckFunctionExists.c.o  -o cmTryCompileExec2608520401 -rdynamic -lpthreads -lusb-1.0 
/usr/bin/ld: cannot find -lpthreads
collect2: error: ld returned 1 exit status
CMakeFiles/cmTryCompileExec2608520401.dir/build.make:89: recipe for target 'cmTryCompileExec2608520401' failed
make[1]: *** [cmTryCompileExec2608520401] Error 1
make[1]: Leaving directory '/home/rob/indi-code/3rdparty/CMakeFiles/CMakeTmp'
Makefile:117: recipe for target 'cmTryCompileExec2608520401/fast' failed
make: *** [cmTryCompileExec2608520401/fast] Error 2