1 files changed, 4 insertions, 13 deletions

diff --git a/cmake/platform/linux/gbm.cmake b/cmake/platform/linux/gbm.cmake
index 75b23f3..8f17ef6 100644
--- a/cmake/platform/linux/gbm.cmake
+++ b/cmake/platform/linux/gbm.cmake
@@ -1,17 +1,8 @@
-set(PLATFORM_REQUIRED_DEPS EGL GBM LibDRM LibInput Xkbcommon)
-set(PLATFORM_OPTIONAL_DEPS VAAPI)
+list(APPEND PLATFORM_REQUIRED_DEPS EGL GBM LibDRM LibInput Xkbcommon)
+list(APPEND PLATFORM_OPTIONAL_DEPS VAAPI)
 
-set(GBM_RENDER_SYSTEM "" CACHE STRING "Render system to use with GBM: \"gl\" or \"gles\"")
-
-if(GBM_RENDER_SYSTEM STREQUAL "gl")
+if(APP_RENDER_SYSTEM STREQUAL "gl")
   list(APPEND PLATFORM_REQUIRED_DEPS OpenGl)
-  set(APP_RENDER_SYSTEM gl)
-elseif(GBM_RENDER_SYSTEM STREQUAL "gles")
+elseif(APP_RENDER_SYSTEM STREQUAL "gles")
   list(APPEND PLATFORM_REQUIRED_DEPS OpenGLES)
-  set(APP_RENDER_SYSTEM gles)
-else()
-  message(SEND_ERROR "You need to decide whether you want to use GL- or GLES-based rendering in combination with the GBM windowing system. Please set GBM_RENDER_SYSTEM to either \"gl\" or \"gles\". For normal desktop systems, you will usually want to use \"gl\".")
 endif()
-
-# __GBM__ is needed by eglplatform.h in case it is included before gbm.h
-list(APPEND PLATFORM_DEFINES -DMESA_EGL_NO_X11_HEADERS -DEGL_NO_X11 -D__GBM__=1 -DPLATFORM_SETTINGS_FILE=gbm.xml)