CMake not finding GL/glew.h

I'm using CLion under pop_OS! 20.04 and am currently trying to get CMake to work with GLEW because I want to follow these tutorials to get started with OpenGL. I'm relatively new to C/C++ and completely new to CMake.

I installed the libgl1-mesa-dev,libglew-dev,libglfw3,libglfw3-dev packages with apt-get install and the glew.h is located alongside the other GL header files in /usr/include/GL.

When trying to compile a simple program:

#include <GL/glew.h>

int main() {
    return 0;
}

cmake can't find the headerfile:

test/main.cpp:1:10: fatal error: GL/glew.h: No such file or directory
    1 | #include <GL/glew.h>
      |          ^~~~~~~~~~~

Do I have to manually add these header files in CMakeLists.txt for cmake to find them? I tried like a dozen different suggestions but I didn't get it to work. For example, I tried

cmake_minimum_required(VERSION 3.17)
project(test)

set(CMAKE_CXX_STANDARD 14)

find_package(GLEW REQUIRED)
include_directories(${GLEW_INCLUDE_DIRS})
link_libraries(${GLEW_LIBRARIES})

target_link_libraries(test GLEW::GLEW)

but this results in

CMake Error at /app/extra/clion/bin/cmake/linux/share/cmake-3.17/Modules/FindPackageHandleStandardArgs.cmake:164 (message):
  Could NOT find GLEW (missing: GLEW_INCLUDE_DIRS GLEW_LIBRARIES)

Is this somehow a problem with CLion and I need to include libraries into my project in a different manner? Or am I using cmake in a wrong way?

Solution

Your last try was nearly right.

Forget about include_directories and link_libraries commands. All it needs when doing modern CMake is an add_executable(test main.cpp) followed by a target_link_libraries(test PRIVATE GLEW::glew) command. The target GLEW::glew (case matters here) bundles all compile definitions, include directories, libraries, and further settings that are needed to compile and link your example.

Your CMakeLists.txt would now look like this:

cmake_minimum_required(VERSION 3.17)
project(test)

set(CMAKE_CXX_STANDARD 14)

find_package(GLEW REQUIRED)

add_executable(myTest main.cpp)

target_link_libraries(myTest PRIVATE GLEW::glew)

Edit: Just noticed, that GLEW::GLEW can also be used.