--- gcc-3.4.6/include/filenames.h	2003-07-01 22:29:16.000000000 +0200
+++ include/filenames.h	2013-05-19 20:23:32.000000000 +0200
@@ -43,7 +43,11 @@
 #else  /* not DOSish */
 
 #define IS_DIR_SEPARATOR(c)	((c) == '/')
+#if !defined(__amigaos__)
 #define IS_ABSOLUTE_PATH(f)	(IS_DIR_SEPARATOR((f)[0]))
+#else
+#define IS_ABSOLUTE_PATH(f)	(IS_DIR_SEPARATOR((f)[0]) || strchr((f), VOL_SEPARATOR))
+#endif
 #define FILENAME_CMP(s1, s2)	strcmp(s1, s2)
 
 #endif /* not DOSish */