fix for -fno-common
https://svnweb.freebsd.org/ports?view=revision&revision=546840

Index: panel/plugin.c
--- panel/plugin.c.orig
+++ panel/plugin.c
@@ -17,6 +17,7 @@
 //#define DEBUGPRN
 #include "dbg.h"
 extern panel *the_panel;
+struct _plugin_instance *stam;
 
 
 /**************************************************************/