Determining if the pthread_create exist failed with the following output:
Change Dir: /home/cs18/Desktop/games101_homework/08/CGL/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_4e9e8/fast"
/usr/bin/make -f CMakeFiles/cmTC_4e9e8.dir/build.make CMakeFiles/cmTC_4e9e8.dir/build
make[1]: Entering directory '/home/cs18/Desktop/games101_homework/08/CGL/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_4e9e8.dir/CheckSymbolExists.c.o
/usr/bin/cc    -o CMakeFiles/cmTC_4e9e8.dir/CheckSymbolExists.c.o   -c /home/cs18/Desktop/games101_homework/08/CGL/build/CMakeFiles/CMakeTmp/CheckSymbolExists.c
Linking C executable cmTC_4e9e8
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_4e9e8.dir/link.txt --verbose=1
/usr/bin/cc      -rdynamic CMakeFiles/cmTC_4e9e8.dir/CheckSymbolExists.c.o  -o cmTC_4e9e8 
CMakeFiles/cmTC_4e9e8.dir/CheckSymbolExists.c.o: In function `main':
CheckSymbolExists.c:(.text+0x1b): undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_4e9e8.dir/build.make:97: recipe for target 'cmTC_4e9e8' failed
make[1]: *** [cmTC_4e9e8] Error 1
make[1]: Leaving directory '/home/cs18/Desktop/games101_homework/08/CGL/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_4e9e8/fast' failed
make: *** [cmTC_4e9e8/fast] Error 2

File /home/cs18/Desktop/games101_homework/08/CGL/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: /home/cs18/Desktop/games101_homework/08/CGL/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_aea04/fast"
/usr/bin/make -f CMakeFiles/cmTC_aea04.dir/build.make CMakeFiles/cmTC_aea04.dir/build
make[1]: Entering directory '/home/cs18/Desktop/games101_homework/08/CGL/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_aea04.dir/CheckFunctionExists.c.o
/usr/bin/cc   -DCHECK_FUNCTION_EXISTS=pthread_create   -o CMakeFiles/cmTC_aea04.dir/CheckFunctionExists.c.o   -c /usr/share/cmake-3.10/Modules/CheckFunctionExists.c
Linking C executable cmTC_aea04
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_aea04.dir/link.txt --verbose=1
/usr/bin/cc  -DCHECK_FUNCTION_EXISTS=pthread_create    -rdynamic CMakeFiles/cmTC_aea04.dir/CheckFunctionExists.c.o  -o cmTC_aea04 -lpthreads 
/usr/bin/ld: cannot find -lpthreads
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_aea04.dir/build.make:97: recipe for target 'cmTC_aea04' failed
make[1]: *** [cmTC_aea04] Error 1
make[1]: Leaving directory '/home/cs18/Desktop/games101_homework/08/CGL/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_aea04/fast' failed
make: *** [cmTC_aea04/fast] Error 2


Determining if the function glXGetProcAddressEXT exists failed with the following output:
Change Dir: /home/cs18/Desktop/games101_homework/08/CGL/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_d5fb6/fast"
/usr/bin/make -f CMakeFiles/cmTC_d5fb6.dir/build.make CMakeFiles/cmTC_d5fb6.dir/build
make[1]: Entering directory '/home/cs18/Desktop/games101_homework/08/CGL/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_d5fb6.dir/CheckFunctionExists.c.o
/usr/bin/cc   -DCHECK_FUNCTION_EXISTS=glXGetProcAddressEXT   -o CMakeFiles/cmTC_d5fb6.dir/CheckFunctionExists.c.o   -c /usr/share/cmake-3.10/Modules/CheckFunctionExists.c
Linking C executable cmTC_d5fb6
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_d5fb6.dir/link.txt --verbose=1
/usr/bin/cc  -DCHECK_FUNCTION_EXISTS=glXGetProcAddressEXT    -rdynamic CMakeFiles/cmTC_d5fb6.dir/CheckFunctionExists.c.o  -o cmTC_d5fb6 /usr/lib/x86_64-linux-gnu/libGL.so 
CMakeFiles/cmTC_d5fb6.dir/CheckFunctionExists.c.o: In function `main':
CheckFunctionExists.c:(.text+0x10): undefined reference to `glXGetProcAddressEXT'
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_d5fb6.dir/build.make:98: recipe for target 'cmTC_d5fb6' failed
make[1]: *** [cmTC_d5fb6] Error 1
make[1]: Leaving directory '/home/cs18/Desktop/games101_homework/08/CGL/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_d5fb6/fast' failed
make: *** [cmTC_d5fb6/fast] Error 2