P2AK

Could someone lend me a hand with what I'm missing to compile this please? This is the error I get: /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_8b908.dir/link.txt --verbose=1 /usr/bin/cc -DCHECK_FUNCTION_EXISTS=pthread_create -rdynamic CMakeFiles/cmTC_8b908.dir/CheckFunctionExists.c.o -o...