replace // with /* */
diff --git a/progs/egl/demo2.c b/progs/egl/demo2.c
index e04dc1f..7abe947 100644
--- a/progs/egl/demo2.c
+++ b/progs/egl/demo2.c
@@ -9,7 +9,7 @@
 
 #include <GLES/egl.h>
 
-//#define FRONTBUFFER
+/*#define FRONTBUFFER*/
 
 static void _subset_Rectf(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2)
 {