--- a/ChangeLog	Wed Oct 17 10:30:48 2018 -0700
+++ b/ChangeLog	Tue Oct 16 18:44:33 2018 +0200
@@ -1,3 +1,12 @@
+2018-10-16  Bruno Haible  <bruno@clisp.org>
+
+	mountlist: Remove support for SVR2.
+	Reported by Andrew Borodin <aborodin@vmail.ru> in
+	<https://lists.gnu.org/archive/html/bug-gnulib/2018-10/msg00101.html>.
+	* lib/mountlist.c: Remove MOUNTED_FREAD case.
+	* m4/ls-mntd-fs.m4 (gl_LIST_MOUNTED_FILE_SYSTEMS): Don't define
+	MOUNTED_FREAD.
+
 2018-10-15  Paul Eggert  <eggert@cs.ucla.edu>
 
 	libc-config: merge from glibc

--- a/lib/mountlist.c	Wed Oct 17 10:30:48 2018 -0700
+++ b/lib/mountlist.c	Tue Oct 16 18:44:33 2018 +0200
@@ -97,10 +97,6 @@
 # include <dirent.h>
 #endif
 
-#ifdef MOUNTED_FREAD            /* (obsolete) SVR2 */
-# include <mnttab.h>
-#endif
-
 #ifdef MOUNTED_FREAD_FSTYP      /* (obsolete) SVR3 */
 # include <mnttab.h>
 # include <sys/fstyp.h>
@@ -838,7 +834,7 @@
   }
 #endif /* MOUNTED_GETFSSTAT */
 
-#if defined MOUNTED_FREAD || defined MOUNTED_FREAD_FSTYP /* (obsolete) SVR3, SVR2 */
+#if defined MOUNTED_FREAD_FSTYP /* (obsolete) SVR3 */
   {
     struct mnttab mnt;
     char *table = "/etc/mnttab";
@@ -851,19 +847,12 @@
     while (fread (&mnt, sizeof mnt, 1, fp) > 0)
       {
         me = xmalloc (sizeof *me);
-# ifdef GETFSTYP                        /* SVR3.  */
         me->me_devname = xstrdup (mnt.mt_dev);
-# else
-        me->me_devname = xmalloc (strlen (mnt.mt_dev) + 6);
-        strcpy (me->me_devname, "/dev/");
-        strcpy (me->me_devname + 5, mnt.mt_dev);
-# endif
         me->me_mountdir = xstrdup (mnt.mt_filsys);
         me->me_mntroot = NULL;
         me->me_dev = (dev_t) -1;        /* Magic; means not known yet. */
         me->me_type = "";
         me->me_type_malloced = 0;
-# ifdef GETFSTYP                        /* SVR3.  */
         if (need_fs_type)
           {
             struct statfs fsd;
@@ -876,7 +865,6 @@
                 me->me_type_malloced = 1;
               }
           }
-# endif
         me->me_dummy = ME_DUMMY (me->me_devname, me->me_type);
         me->me_remote = ME_REMOTE (me->me_devname, me->me_type);
 
@@ -897,7 +885,7 @@
     if (fclose (fp) == EOF)
       goto free_then_fail;
   }
-#endif /* MOUNTED_FREAD || MOUNTED_FREAD_FSTYP.  */
+#endif /* MOUNTED_FREAD_FSTYP.  */
 
 #ifdef MOUNTED_GETMNTTBL        /* (obsolete) DolphinOS */
   {

--- a/m4/ls-mntd-fs.m4	Wed Oct 17 10:30:48 2018 -0700
+++ b/m4/ls-mntd-fs.m4	Tue Oct 16 18:44:33 2018 +0200
@@ -1,4 +1,4 @@
-# serial 34
+# serial 35
 # How to list mounted file systems.
 
 # Copyright (C) 1998-2004, 2006, 2009-2018 Free Software Foundation, Inc.
@@ -354,23 +354,6 @@
   fi
 
   if test -z "$ac_list_mounted_fs"; then
-    # (obsolete) SVR2.
-    AC_CACHE_CHECK([whether it is possible to resort to fread on /etc/mnttab],
-      [fu_cv_sys_mounted_fread],
-      [AC_PREPROC_IFELSE([AC_LANG_SOURCE([[#include <mnttab.h>]])],
-         [fu_cv_sys_mounted_fread=yes],
-         [fu_cv_sys_mounted_fread=no])
-      ])
-    if test $fu_cv_sys_mounted_fread = yes; then
-      ac_list_mounted_fs=found
-      AC_DEFINE([MOUNTED_FREAD], [1],
-        [Define if there is no specific function for reading the list of
-         mounted file systems.  fread will be used to read /etc/mnttab.
-         (SVR2) ])
-    fi
-  fi
-
-  if test -z "$ac_list_mounted_fs"; then
     # Interix / BSD alike statvfs
     # the code is really interix specific, so make sure, we're on it.
     case "$host" in