Index: src/libaudcore/vfs.h
--- src/libaudcore/vfs.h.orig
+++ src/libaudcore/vfs.h
@@ -51,6 +51,7 @@ enum VFSReadOptions
 
 enum VFSSeekType
 {
+    VFS_SEEK_UNK = -1,
     VFS_SEEK_SET = 0,
     VFS_SEEK_CUR = 1,
     VFS_SEEK_END = 2,
