--- a/physfs_internal.h	Sun Jul 08 05:27:05 2001 +0000
+++ b/physfs_internal.h	Sun Jul 08 10:58:10 2001 +0000
@@ -240,6 +240,7 @@
 #define ERR_NO_WRITE_DIR         "Write directory is not set"
 #define ERR_NO_SUCH_FILE         "No such file"
 #define ERR_PAST_EOF             "Past end of file"
+#define ERR_ARC_IS_READ_ONLY     "Archive is read-only"
 
 /*
  * Call this to set the message returned by PHYSFS_getLastError().