diff --git a/include/openbsc/openbscdefines.h b/include/openbsc/openbscdefines.h
new file mode 100644
index 0000000..082e592
--- /dev/null
+++ b/include/openbsc/openbscdefines.h
@@ -0,0 +1,35 @@
+/* 
+ * (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef OPENBSCDEFINES_H
+#define OPENBSCDEFINES_H
+
+#ifdef BUILDING_ON_WINDOWS
+    #ifdef BUILDING_OPENBSC
+        #define BSC_API __declspec(dllexport)
+    #else
+        #define BSC_API __declspec(dllimport)
+    #endif
+#else
+    #define BSC_API __attribute__((visibility("default")))
+#endif
+
+#endif