gl.h shouldn't be required when not enabling gl

diff --git a/render/gradient.c b/render/gradient.c
index 6b22c6b..31d4c73 100644 (file)
--- a/render/gradient.c
+++ b/render/gradient.c
@@ -1,4 +1,6 @@
+#ifdef USE_GL
 #include <GL/gl.h>
+#endif /* USE_GL */
 #include <glib.h>
 #include "render.h"
 #include "gradient.h"