raysan5.raylib/cmake/GlfwImport.cmake

if(USE_EXTERNAL_GLFW STREQUAL "ON")
    find_package(glfw3 3.2.1 REQUIRED)
elseif(USE_EXTERNAL_GLFW STREQUAL "IF_POSSIBLE")
    find_package(glfw3 3.2.1 QUIET)
endif()
if (glfw3_FOUND)
    set(LIBS_PRIVATE ${LIBS_PRIVATE} glfw)
endif()

# Explicitly check against "ON", because USE_EXTERNAL_GLFW is a tristate option
# Also adding only on desktop (web also uses glfw but it is more limited and is added using an emcc linker flag)
if(NOT glfw3_FOUND AND NOT USE_EXTERNAL_GLFW STREQUAL "ON" AND "${PLATFORM}" MATCHES "Desktop")
    MESSAGE(STATUS "Using raylib's GLFW")
    set(GLFW_BUILD_DOCS OFF CACHE BOOL "" FORCE)
    set(GLFW_BUILD_TESTS OFF CACHE BOOL "" FORCE)
    set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
    set(GLFW_INSTALL OFF CACHE BOOL "" FORCE)
    set(GLFW_USE_WAYLAND ${USE_WAYLAND} CACHE BOOL "" FORCE)
    
    set(WAS_SHARED ${BUILD_SHARED_LIBS})
    set(BUILD_SHARED_LIBS OFF CACHE BOOL " " FORCE)

    add_subdirectory(external/glfw)

    set(BUILD_SHARED_LIBS ${WAS_SHARED} CACHE BOOL " " FORCE)
    unset(WAS_SHARED)
    
    list(APPEND raylib_sources $<TARGET_OBJECTS:glfw_objlib>)
    include_directories(BEFORE SYSTEM external/glfw/include)
else()
    MESSAGE(STATUS "Using external GLFW")
    set(GLFW_PKG_DEPS glfw3)
endif()