OpenGL: undefined reference to `gladLoadGLLoader'

## undefined reference to `gladLoadGLLoader' ```sh [100%] Linking CXX executable example CMakeFiles/example.dir/example.cpp.o: In function `main': example.cpp:(.text+0xc7): undefined reference to `gladLoadGLLoader' example.cpp:(.text+0x127): undefined reference to `glad_glClearColor' example.cpp:(.text+0x150): undefined reference to `glad_glClear' CMakeFiles/example.dir/example.cpp.o: In function `framebuffer_size_callback(GLFWwindow*, int, int)': example.cpp:(.text+0x1ca): undefined reference to `glad_glViewport' collect2: error: ld returned 1 exit status CMakeFiles/example.dir/build.make:98: recipe for target 'example' failed make[2]: *** [example] Error 1 ``` ## Solution comple with glad.c ```sh add_executable(example example.cpp glad.c) ``` ## Reference - https://discourse.glfw.org/t/error-compiling-simple-c-using-gcc/730