Determining if the pthread_create exist failed with the following output: Change Dir: /home/pi/gopigo3_ws/build/CMakeFiles/CMakeTmp Run Build Command:"/usr/bin/make" "cmTC_abb1d/fast" /usr/bin/make -f CMakeFiles/cmTC_abb1d.dir/build.make CMakeFiles/cmTC_abb1d.dir$ make[1]: Entering directory '/home/pi/gopigo3_ws/build/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_abb1d.dir/CheckSymbolExists.c.o /usr/bin/cc -o CMakeFiles/cmTC_abb1d.dir/CheckSymbolExists.c.o -c /home/p$ Linking C executable cmTC_abb1d /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_abb1d.dir/link.txt --verbos$ /usr/bin/cc CMakeFiles/cmTC_abb1d.dir/CheckSymbolExists.c.o -o cmTC_abb1$ CMakeFiles/cmTC_abb1d.dir/CheckSymbolExists.c.o: In function `main': CheckSymbolExists.c:(.text+0x38): undefined reference to `pthread_create' collect2: error: ld returned 1 exit status CMakeFiles/cmTC_abb1d.dir/build.make:97: recipe for target 'cmTC_abb1d' failed make[1]: *** [cmTC_abb1d] Error 1 make[1]: Leaving directory '/home/pi/gopigo3_ws/build/CMakeFiles/CMakeTmp' Makefile:126: recipe for target 'cmTC_abb1d/fast' failed make: *** [cmTC_abb1d/fast] Error 2