diff --git a/Makefile b/Makefile
index 7fe9d5a3..0b812d29 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ DEBUG_UBSAN   := 0
 NO_REND       := 0
 HAVE_GL       := 1
 HAVE_GL2      := 0
-HAVE_OIT      := 0
+HAVE_OIT      ?= 0
 HAVE_VULKAN   := 0
 HAVE_CORE     := 0
 NO_THREADS    := 0