Cmake Configuring incomplete, error occurred | Box2d / Linux - cmake

Question

I am not able to configure cmake.
The issue is as described below about I am unable to make most of it:
CMake error at /snap/cmake/936/share/cmake-3.21/Modules/FindPackageHandleStandardArgs.cmake230 (message):Could NOT find X11 (missing: X11_X11_INCLUDE_PATH X11_X11_LIB)
Call Stack (most recent call first):
/snap/cmake/936/share/cmake-3.21/Modules/FindPackageHandleStandardArgs.cmake594 (_FPHSA_FAILURE_MESSAGE)
/snap/cmake/936/share/cmake-3.21/Modules/FindXII.camke:457 (find_package_handle_Standard_args)
extern/glfx/CMakeLists.txt:27 (find package)
Below is the error log (CmakeErrorLog):
Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output:
Change Dir: /home/hariton/Box2D/Box2D/Testbed/Build/CMakeFiles/CMakeTmp
Run Build Command(s):/usr/bin/make -f Makefile cmTC_81640/fast && /usr/bin/make -f CMakeFiles/cmTC_81640.dir/build.make CMakeFiles/cmTC_81640.dir/build
make[1]: Entering directory '/home/hariton/Box2D/Box2D/Testbed/Build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_81640.dir/src.c.o
/usr/bin/cc -DCMAKE_HAVE_LIBC_PTHREAD -o CMakeFiles/cmTC_81640.dir/src.c.o -c /home/hariton/Box2D/Box2D/Testbed/Build/CMakeFiles/CMakeTmp/src.c
Linking C executable cmTC_81640
/snap/cmake/936/bin/cmake -E cmake_link_script CMakeFiles/cmTC_81640.dir/link.txt --verbose=1
/usr/bin/cc CMakeFiles/cmTC_81640.dir/src.c.o -o cmTC_81640
/usr/bin/ld: CMakeFiles/cmTC_81640.dir/src.c.o: in function `main':
src.c:(.text+0x46): undefined reference to `pthread_create'
/usr/bin/ld: src.c:(.text+0x52): undefined reference to `pthread_detach'
/usr/bin/ld: src.c:(.text+0x5e): undefined reference to `pthread_cancel'
/usr/bin/ld: src.c:(.text+0x6f): undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status
make[1]: *** [CMakeFiles/cmTC_81640.dir/build.make:99: cmTC_81640] Error 1
make[1]: Leaving directory '/home/hariton/Box2D/Box2D/Testbed/Build/CMakeFiles/CMakeTmp'
make: *** [Makefile:127: cmTC_81640/fast] Error 2
Source file was:
#include <pthread.h>
static void* test_func(void* data)
{
return data;
}
int main(void)
{
pthread_t thread;
pthread_create(&thread, NULL, test_func, NULL);
pthread_detach(thread);
pthread_cancel(thread);
pthread_join(thread, NULL);
pthread_atfork(NULL, NULL, NULL);
pthread_exit(NULL);
return 0;
}
Determining if the function pthread_create exists in the pthreads failed with the following output:
Change Dir: /home/hariton/Box2D/Box2D/Testbed/Build/CMakeFiles/CMakeTmp
Run Build Command(s):/usr/bin/make -f Makefile cmTC_f6423/fast && /usr/bin/make -f CMakeFiles/cmTC_f6423.dir/build.make CMakeFiles/cmTC_f6423.dir/build
make[1]: Entering directory '/home/hariton/Box2D/Box2D/Testbed/Build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_f6423.dir/CheckFunctionExists.c.o
/usr/bin/cc -DCHECK_FUNCTION_EXISTS=pthread_create -o CMakeFiles/cmTC_f6423.dir/CheckFunctionExists.c.o -c /snap/cmake/936/share/cmake-3.21/Modules/CheckFunctionExists.c
Linking C executable cmTC_f6423
/snap/cmake/936/bin/cmake -E cmake_link_script CMakeFiles/cmTC_f6423.dir/link.txt --verbose=1
/usr/bin/cc -DCHECK_FUNCTION_EXISTS=pthread_create CMakeFiles/cmTC_f6423.dir/CheckFunctionExists.c.o -o cmTC_f6423 -lpthreads
/usr/bin/ld: cannot find -lpthreads
collect2: error: ld returned 1 exit status
make[1]: *** [CMakeFiles/cmTC_f6423.dir/build.make:99: cmTC_f6423] Error 1
make[1]: Leaving directory '/home/hariton/Box2D/Box2D/Testbed/Build/CMakeFiles/CMakeTmp'
make: *** [Makefile:127: cmTC_f6423/fast] Error 2
The output log is too big and I cannot post it (maybe can post parts of it).
I am positive that I have all needed libraries installed. The issue must lie with the cmake implementation.
What is did is the following
Basically I was at the CMake master file and I wanted to run it at the testbed folder of box2d.
Can anyone help me out please?
If more information is needed let me know

Answer 1

Eventually was able to configure cmake without error
Initially the problem was because the following library was not installed: x11-dev
Then another error came up, as noted in the above comment.
After installing the following xorg-dev libglu1-mesa-dev the configuration was completed without any errors.
Thank you both for the help!