diff --git a/src/common/attributes/gm.c b/src/common/attributes/gm.c
new file mode 100644
index 000000000..be93d5f17
--- /dev/null
+++ b/src/common/attributes/gm.c
@@ -0,0 +1,60 @@
+/* vi: set ts=2:
+ *
+ * $Id: gm.c,v 1.1 2001/02/17 15:04:06 enno Exp $
+ * Eressea PB(E)M host Copyright (C) 1998-2000
+ *      Christian Schlittchen (corwin@amber.kn-bremen.de)
+ *      Katja Zedel (katze@felidae.kn-bremen.de)
+ *      Henning Peters (faroul@beyond.kn-bremen.de)
+ *      Enno Rehling (enno@eressea-pbem.de)
+ *      Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
+ *
+ * This program may not be used, modified or distributed without
+ * prior permission by the authors of Eressea.
+ */
+
+#include <config.h>
+#include <eressea.h>
+#include "gm.h"
+
+/* kernel includes */
+#include <plane.h>
+
+/* util includes */
+#include <attrib.h>
+
+static void
+write_gm(const attrib * a, FILE * F)
+{
+	write_plane_reference((plane*)a->data.v, F);
+}
+
+static int
+read_gm(attrib * a, FILE * F)
+{
+	read_plane_reference((plane**)&a->data.v, F);
+	return 1;
+}
+
+
+attrib_type at_gm = {
+	"gm",
+	NULL,
+	NULL,
+	NULL,
+	write_gm,
+	read_gm,
+};
+
+attrib *
+make_gm(const struct plane * pl)
+{
+	attrib * a = a_new(&at_gm);
+	a->data.v = (void*)pl;
+	return a;
+}
+
+void
+init_gm(void)
+{
+	at_register(&at_gm);
+}
diff --git a/src/common/attributes/gm.h b/src/common/attributes/gm.h
new file mode 100644
index 000000000..b461ac8e4
--- /dev/null
+++ b/src/common/attributes/gm.h
@@ -0,0 +1,21 @@
+/* vi: set ts=2:
+ *
+ * $Id: gm.h,v 1.1 2001/02/17 15:04:06 enno Exp $
+ * Eressea PB(E)M host Copyright (C) 1998-2000
+ *      Christian Schlittchen (corwin@amber.kn-bremen.de)
+ *      Katja Zedel (katze@felidae.kn-bremen.de)
+ *      Henning Peters (faroul@beyond.kn-bremen.de)
+ *      Enno Rehling (enno@eressea-pbem.de)
+ *      Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
+ *
+ * This program may not be used, modified or distributed without
+ * prior permission by the authors of Eressea.
+ */
+
+/* this is an attribute used by the kernel (isallied) */
+
+struct plane;
+extern struct attrib_type at_gm;
+
+extern struct attrib * make_gm(const struct plane *pl);
+extern void init_gm(void);