diff -Nru texinfo-4.0/util/Makefile.am texinfo-4.0.new/util/Makefile.am
--- texinfo-4.0/util/Makefile.am	Sat Jul 17 00:00:26 1999
+++ texinfo-4.0.new/util/Makefile.am	Thu Oct 12 21:33:37 2000
@@ -7,7 +7,7 @@
 
 localedir = $(datadir)/locale
 INCLUDES = -I$(top_srcdir)/lib -I../intl -DLOCALEDIR=\"$(localedir)\"
-LDADD = ../lib/libtxi.a @INTLLIBS@
+LDADD = ../lib/libtxi.a -lz @INTLLIBS@
 
 # Most of these are just for fun.  The only one that's really supported
 # is texi2dvi.
diff -Nru texinfo-4.0/util/install-info.c texinfo-4.0.new/util/install-info.c
--- texinfo-4.0/util/install-info.c	Thu Oct 12 21:34:07 2000
+++ texinfo-4.0.new/util/install-info.c	Thu Oct 12 21:33:06 2000
@@ -19,6 +19,7 @@
 
 #include "system.h"
 #include <getopt.h>
+#include <zlib.h>
 
 static char *progname = "install-info";
 
@@ -481,7 +482,7 @@
    COMPRESSION_PROGRAM.  The compression program is determined by the
    magic number, not the filename.  */
 
-FILE *
+gzFile
 open_possibly_compressed_file (filename, create_callback,
                                opened_filename, compression_program, is_pipe)
      char *filename;
@@ -493,7 +494,7 @@
   char *local_opened_filename, *local_compression_program;
   int nread;
   char data[4];
-  FILE *f;
+  gzFile *f;
 
   /* We let them pass NULL if they don't want this info, but it's easier
      to always determine it.  */
@@ -501,23 +502,23 @@
     opened_filename = &local_opened_filename;
 
   *opened_filename = filename;
-  f = fopen (*opened_filename, FOPEN_RBIN);
+  f = gzopen (*opened_filename, FOPEN_RBIN);
   if (!f)
     {
       *opened_filename = concat (filename, ".gz", "");
-      f = fopen (*opened_filename, FOPEN_RBIN);
+      f = gzopen (*opened_filename, FOPEN_RBIN);
 #ifdef __MSDOS__
       if (!f)
         {
           free (*opened_filename);
           *opened_filename = concat (filename, ".igz", "");
-          f = fopen (*opened_filename, FOPEN_RBIN);
+          f = gzopen (*opened_filename, FOPEN_RBIN);
         }
       if (!f)
         {
           free (*opened_filename);
           *opened_filename = concat (filename, ".inz", "");
-          f = fopen (*opened_filename, FOPEN_RBIN);
+          f = gzopen (*opened_filename, FOPEN_RBIN);
         }
 #endif
       if (!f)
@@ -529,7 +530,7 @@
               /* And try opening it again.  */
               free (*opened_filename);
               *opened_filename = filename;
-              f = fopen (*opened_filename, FOPEN_RBIN);
+              f = gzopen (*opened_filename, FOPEN_RBIN);
               if (!f)
                 pfatal_with_name (filename);
             }
@@ -538,54 +539,7 @@
         }
     }
 
-  /* Read first few bytes of file rather than relying on the filename.
-     If the file is shorter than this it can't be usable anyway.  */
-  nread = fread (data, sizeof (data), 1, f);
-  if (nread != 1)
-    {
-      /* Empty files don't set errno, so we get something like
-         "install-info: No error for foo", which is confusing.  */
-      if (nread == 0)
-        fatal (_("%s: empty file"), *opened_filename);
-      pfatal_with_name (*opened_filename);
-    }
-
-  if (!compression_program)
-    compression_program = &local_compression_program;
-
-  if (data[0] == '\x1f' && data[1] == '\x8b')
-#if STRIP_DOT_EXE
-    /* An explicit .exe yields a better diagnostics from popen below
-       if they don't have gzip installed.  */
-    *compression_program = "gzip.exe";
-#else
-    *compression_program = "gzip";
-#endif
-  else
-    *compression_program = NULL;
-
-  if (*compression_program)
-    { /* It's compressed, so fclose the file and then open a pipe.  */
-      char *command = concat (*compression_program," -cd <", *opened_filename);
-      if (fclose (f) < 0)
-        pfatal_with_name (*opened_filename);
-      f = popen (command, "r");
-      if (f)
-        *is_pipe = 1;
-      else
-        pfatal_with_name (command);
-    }
-  else
-    { /* It's a plain file, seek back over the magic bytes.  */
-      if (fseek (f, 0, 0) < 0)
-        pfatal_with_name (*opened_filename);
-#if O_BINARY
-      /* Since this is a text file, and we opened it in binary mode,
-         switch back to text mode.  */
-      f = freopen (*opened_filename, "r", f);
-#endif
-      *is_pipe = 0;
-    }
+  *is_pipe = 0;
 
   return f;
 }
@@ -608,7 +562,7 @@
      char **compression_program;
 {
   char *real_name;
-  FILE *f;
+  gzFile *f;
   int pipe_p;
   int filled = 0;
   int data_size = 8192;
@@ -622,7 +576,7 @@
 
   for (;;)
     {
-      int nread = fread (data + filled, 1, data_size - filled, f);
+      int nread = gzread (f, data + filled, data_size - filled);
       if (nread < 0)
         pfatal_with_name (real_name);
       if (nread == 0)
@@ -641,10 +595,7 @@
   /* We need to close the stream, since on some systems the pipe created
      by popen is simulated by a temporary file which only gets removed
      inside pclose.  */
-  if (pipe_p)
-    pclose (f);
-  else
-    fclose (f);
+  gzclose(f);
 
   *sizep = filled;
   return data;
@@ -1407,7 +1358,7 @@
     warning (_("no entries found for `%s'; nothing deleted"), infile);
 
   output_dirfile (opened_dirfilename, dir_nlines, dir_lines, n_entries_to_add,
-                  entries_to_add, input_sections, compression_program);
+                  entries_to_add, input_sections, NULL);
 
   xexit (0);
 }