cmake: enable MLN_WITH_EGL and OPENGL_USE_GLES for Wayland (#2022)

platform/linux/linux.cmake

@@ -15,6 +15,18 @@ find_package(Threads REQUIRED)
 pkg_search_module(WEBP libwebp REQUIRED)
 pkg_search_module(LIBUV libuv REQUIRED)
 
+if(MLN_WITH_WAYLAND)
+    # See https://github.com/maplibre/maplibre-native/pull/2022
+
+    # MLN_WITH_EGL needs to be set for Wayland, otherwise this CMakeLists will
+    # call find_package(OpenGL REQUIRED GLX), which is for X11.
+    set(MLN_WITH_EGL TRUE)
+
+    # OPENGL_USE_GLES2 or OPENGL_USE_GLES3 need to be set, otherwise
+    # FindOpenGL.cmake will include the GLVND library, which is for X11.
+    set(OPENGL_USE_GLES3 TRUE)
+endif()
+
 target_sources(
     mbgl-core
     PRIVATE