--- CMakeLists.txt.old	2018-09-18 11:43:13.956293781 -0300
+++ CMakeLists.txt	2018-09-18 11:44:17.068296236 -0300
@@ -1544,6 +1544,7 @@
 
 if(VIDEO_VULKAN)
   set(SDL_VIDEO_VULKAN 1)
+  set(HAVE_VIDEO_VULKAN ON)
 endif()
 
 # Dummies