diff -up texinfo-5.1/install-info/install-info.c.orig texinfo-5.1/install-info/install-info.c

--- texinfo-5.1/install-info/install-info.c.orig	2013-03-18 12:37:15.375860494 +0100

+++ texinfo-5.1/install-info/install-info.c	2013-03-18 12:37:42.589012295 +0100

@@ -835,7 +835,7 @@ open_possibly_compressed_file (char *fil

     }

   else

     { /* It's a plain file, seek back over the magic bytes.  */

-      if (gzseek (f, 0, SEEK_SET) < 0)

+      if (gzseek (f, 0, SEEK_SET) == -1)

         pfatal_with_name (*opened_filename);

 #if 0 && O_BINARY

       /* Since this is a text file, and we opened it in binary mode,