1 files changed, 7 insertions, 1 deletions
diff --git a/libvo/vo_gl2.c b/libvo/vo_gl2.c
index 7b49ffb09e..f1afcb03c3 100644
--- a/libvo/vo_gl2.c
+++ b/libvo/vo_gl2.c
@@ -10,6 +10,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <math.h>
+#include <errno.h>
 
 #include "config.h"
 #include "video_out.h"
@@ -1102,7 +1103,12 @@ uninit(void)
 
 static uint32_t preinit(const char *arg)
 {
-  return 0;
+    if(arg) 
+    {
+	printf("[gl2] Unknown subdevice: %s\n",arg);
+	return ENOSYS;
+    }
+    return 0;
 }
 
 static uint32_t control(uint32_t request, void *data, ...)