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-rw-r--r--mate-panel/panel-background-monitor.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/mate-panel/panel-background-monitor.h b/mate-panel/panel-background-monitor.h
index 29cafd66..56140bc9 100644
--- a/mate-panel/panel-background-monitor.h
+++ b/mate-panel/panel-background-monitor.h
@@ -27,6 +27,12 @@
#ifndef __PANEL_BACKGROUND_MONITOR_H__
#define __PANEL_BACKGROUND_MONITOR_H__
+#ifdef PACKAGE_NAME // only check HAVE_X11 if config.h has been included
+#ifndef HAVE_X11
+#error file should only be included when HAVE_X11 is enabled
+#endif
+#endif
+
#include <glib.h>
#include <glib-object.h>
#include <gdk/gdk.h>