--- /dev/null
+/*
+ Copyright (C) 1995 Ian Jackson <iwj10@cus.cam.ac.uk>
+ Copyright (C) 2001 Anthony Towns <aj@azure.humbug.org.au>
+ Copyright (C) 2008-2016 Free Software Foundation, Inc.
+
+ 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, either version 3 of the License, or
+ (at your option) any later version.
+
+ 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, see <http://www.gnu.org/licenses/>. */
+
+#ifndef FILEVERCMP_H
+#define FILEVERCMP_H
+
+/* Compare version strings:
+
+ This function compares strings S1 and S2:
+ 1) By PREFIX in the same way as strcmp.
+ 2) Then by VERSION (most similarly to version compare of Debian's dpkg).
+ Leading zeros in version numbers are ignored.
+ 3) If both (PREFIX and VERSION) are equal, strcmp function is used for
+ comparison. So this function can return 0 if (and only if) strings S1
+ and S2 are identical.
+
+ It returns number >0 for S1 > S2, 0 for S1 == S2 and number <0 for S1 < S2.
+
+ This function compares strings, in a way that if VER1 and VER2 are version
+ numbers and PREFIX and SUFFIX (SUFFIX defined as (\.[A-Za-z~][A-Za-z0-9~]*)*)
+ are strings then VER1 < VER2 implies filevercmp (PREFIX VER1 SUFFIX,
+ PREFIX VER2 SUFFIX) < 0.
+
+ This function is intended to be a replacement for strverscmp. */
+int filevercmp (const char *s1, const char *s2) _GL_ATTRIBUTE_PURE;
+
+#endif /* FILEVERCMP_H */