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diff --git a/lib_internal/unify.h b/lib_internal/unify.h
new file mode 100644
index 0000000..77ac6bd
--- /dev/null
+++ b/lib_internal/unify.h
@@ -0,0 +1,59 @@
+// $Id: unify.h,v 1.5 2005/03/18 03:55:03 ensc Exp $    --*- c -*--
+
+// Copyright (C) 2004 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+//  
+// 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; version 2 of the License.
+//  
+// 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+#ifndef H_UTIL_VSERVER_LIB_INTERNAL_UNIFY_H
+#define H_UTIL_VSERVER_LIB_INTERNAL_UNIFY_H
+
+#include <sys/stat.h>
+#include <stdbool.h>
+
+bool
+Unify_unify(char const *src, struct stat const *src_stat,
+	    char const *dst, bool ignore_zero) NONNULL((1,2,3));
+
+bool
+Unify_copy(char const *src, struct stat const *src_stat,
+	   char const *dst) NONNULL((1,2,3));
+
+bool
+Unify_deUnify(char const *dst) NONNULL((1));
+
+bool
+Unify_setTime(char const *dst, struct stat const *stat) NONNULL((1,2));
+
+
+typedef enum { unifyUNSUPPORTED, unifyUINLINKABLE, unifyBUSY }	UnifyStatus;
+
+UnifyStatus
+Unify_isIUnlinkable(char const *filename) NONNULL((1));
+
+#define	Unify_isUnified(LHS, RHS)		\
+  ((bool)((LHS)->st_dev ==(RHS)->st_dev  &&	\
+	  (LHS)->st_ino ==(RHS)->st_ino))
+
+#define Unify_isUnifyable(LHS, RHS)		\
+  ((bool)((LHS)->st_dev  ==(RHS)->st_dev  &&	\
+	  (LHS)->st_ino  !=(RHS)->st_ino  &&	\
+	  (LHS)->st_mode ==(RHS)->st_mode &&	\
+	  (LHS)->st_uid  ==(RHS)->st_uid  &&	\
+	  (LHS)->st_gid  ==(RHS)->st_gid  &&	\
+	  (LHS)->st_size ==(RHS)->st_size &&	\
+	  (LHS)->st_mtime==(RHS)->st_mtime))
+  
+
+#endif	//  H_UTIL_VSERVER_LIB_INTERNAL_UNIFY_H