diff --git a/CMakeLists.txt b/CMakeLists.txt
index e6b6f88..a49cdf5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -38,14 +38,16 @@ if(NOT LIBRW_PLATFORM IN_LIST LIBRW_PLATFORMS)
     message(FATAL_ERROR "Illegal LIBRW_PLATFORM=${LIBRW_PLATFORM}")
 endif()
 
-set(LIBRW_GL3_GFXLIBS "GLFW" "SDL2")
-set(LIBRW_GL3_GFXLIB "GLFW" CACHE STRING "gfxlib for gl3 (choices=${LIBRW_GL3_GFXLIBS})")
-set_property(CACHE LIBRW_GL3_GFXLIB PROPERTY STRINGS ${LIBRW_GL3_GFXLIBS})
 if(LIBRW_PLATFORM_GL3)
-    message(STATUS "LIBRW_GL3_GFXLIB = ${LIBRW_GL3_GFXLIB} (choices=${LIBRW_GL3_GFXLIBS})")
-endif()
-if(NOT LIBRW_GL3_GFXLIB IN_LIST LIBRW_GL3_GFXLIBS)
-    message(FATAL_ERROR "Illegal LIBRW_GL3_GFXLIB=${LIBRW_GL3_GFXLIB}")
+    set(LIBRW_GL3_GFXLIBS "GLFW" "SDL2")
+    set(LIBRW_GL3_GFXLIB "GLFW" CACHE STRING "gfxlib for gl3 (choices=${LIBRW_GL3_GFXLIBS})")
+    set_property(CACHE LIBRW_GL3_GFXLIB PROPERTY STRINGS ${LIBRW_GL3_GFXLIBS})
+    if(LIBRW_PLATFORM_GL3)
+        message(STATUS "LIBRW_GL3_GFXLIB = ${LIBRW_GL3_GFXLIB} (choices=${LIBRW_GL3_GFXLIBS})")
+    endif()
+    if(NOT LIBRW_GL3_GFXLIB IN_LIST LIBRW_GL3_GFXLIBS)
+        message(FATAL_ERROR "Illegal LIBRW_GL3_GFXLIB=${LIBRW_GL3_GFXLIB}")
+    endif()
 endif()
 
 if(LIBRW_PLATFORM_PS2)