@@ -13,11 +13,20 @@
  * Public License, either version 2 or 3, which can be found in the file
  * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
  * file.
  */
 
+#ifdef OF_AMIGAOS4
+# define __USE_INLINE__
+# define __NOLIBBASE__
+# define __NOGLOBALIFACE__
+#endif
 #include <proto/exec.h>
+
+#ifdef OF_AMIGAOS4
+extern struct ExecIFace *IExec;
+#endif
 
 bool
 of_mutex_new(of_mutex_t *mutex)
 {
 	InitSemaphore(mutex);