Remove gdbm-1.8.3 compatibility layer

* configure.ac: Remove gdbm-1.8.3 compatibility layer.
Version 1.14.90
* Makefile.am (ACLOCAL_AMFLAGS): Remove deprecated variable.
(MAYBE_EXPORT): Remove variable and conditional.
* NEWS: Update.
* NOTE-WARNING: Update.
* README: Update.
* doc/gdbm.texi: Update.
* export/.gitignore: Remove.
* export/Makefile.am: Remove.
* export/export.c: Remove.

9 files changed, 26 insertions, 241 deletions

diff --git a/Makefile.am b/Makefile.am
index 43a6c2f..6e00dec 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -15,16 +15,12 @@
 # You should have received a copy of the GNU General Public License
 # along with GDBM. If not, see <http://www.gnu.org/licenses/>. */
 
-ACLOCAL_AMFLAGS = -I m4
 EXTRA_DIST = build-aux/config.rpath NOTE-WARNING git2chg.awk
 
 if COMPAT_OPT
   MAYBE_COMPAT = compat
 endif
-if ENABLE_EXPORT
-  MAYBE_EXPORT = export
-endif
-SUBDIRS = po src doc $(MAYBE_COMPAT) $(MAYBE_EXPORT) tests
+SUBDIRS = po src doc $(MAYBE_COMPAT) tests
 
 AM_DISTCHECK_CONFIGURE_FLAGS = --enable-libgdbm-compat
 
diff --git a/NEWS b/NEWS
index 9aceab0..e004eec 100644
--- a/NEWS
+++ b/NEWS
@@ -1,9 +1,18 @@
-GNU dbm NEWS -- history of user-visible changes. 2018-01-03
+GNU dbm NEWS -- history of user-visible changes. 2018-05-19
 Copyright (C) 1990-2018 Free Software Foundation, Inc.
 See the end of file for copying conditions.
 
 Please send gdbm bug reports to <bug-gdbm@gnu.org>.
 
+Version 1.14.90
+
+* Implement database consistency checks
+
+* Improved error checking
+
+* Removed gdbm-1.8.3 compatibility layer
+
+
 Version 1.14.1 - 2018-01-03
 
 * Increment soname current version number.
diff --git a/NOTE-WARNING b/NOTE-WARNING
index 6b1c197..3f21c13 100644
--- a/NOTE-WARNING
+++ b/NOTE-WARNING
@@ -7,28 +7,17 @@ system architectures, or potentially even different compilers.  Differences
 in byte order, the size of file offsets, and even structure packing make
 gdbm files non-portable.
 
-Gdbm version 1.9 includes `large file' support, enabling it on operating
-systems where it is not the default.  `Large file' support is essentially
-when a system uses 64bit file offsets.  Gdbm has, of course, supported `large
-files' on systems where it was the default for a very long time.
-
-On some systems, such as Solaris, this functionality is not enabled by
-default.  Gdbm will now enable it.  THIS MEANS THAT GDBM 1.9 MAY NOT BE
-ABLE TO ACCESS DATABASES CREATED BY PREVIOUS VERIONS ON THE SAME SYSTEM.
-
-Running the `configure' script with the `--disable-largefile' flag should
-produce a backwards-compatible build on such a system.  However, for maximum
-compatibility, and increased functionality, you may want to have your
-application produce a portable copy of your database with the 1.8.3 version
-of the library, and then load it back into version 1.9.
-
-Gdbm 1.9 contains a utility designed to help you produce such a portable
-copy: gdbmexport.  To build it, configure the package with the
---enable-gdbm-export option.  For the information on how to use this
-utility, refer to the documentation, chapter 17 "Export a database into
-a portable format." (run `info gdbm gdbmexport' to access it, once
-gdbm 1.9 has been installed, or `info -f doc/gdbm.info gdbmexport' to
-access the shipped info file).
-
+Therefore, if you intend to send your database to somebody over the wire,
+please dump it into a portable format using gdbm_dump and send the resulting
+file instead. The receiving party will be able to recreate the database from
+the dump using the gdbm_load command.
+
+Please refer to the documentation, chapters 22 and 23, for a detailed
+discussion of these two tools. Run `info gdbm gdbm_dump', if gdbm is
+already installed on your system, or `info -f doc/gdbm.info gdbm_dump'
+to read the docs from the source tree.
+
+The documentation is also available online at
+http://www.gnu.org.ua/software/gdbm/manual.
 
 
diff --git a/README b/README
index 84b1deb..4481b51 100644
--- a/README
+++ b/README
@@ -1,5 +1,4 @@
 GNU dbm README
-Copyright (C) 2011, 2016-2018 Free Software Foundation, Inc.
 See the end of file for copying conditions.
 
 * Introduction
@@ -42,23 +41,6 @@ to install them elsewhere, define the variable COMPATINCLUDEDIR, e.g.
 
  ./configure --enable-libgdbm-compat COMPATINCLUDEDIR=/usr/include/gdbm
 
-** --enable-gdbm-export
-
-Build and install gdbmexport with the specified gdbm 1.8 library.
-
-** --with-gdbm183-library=LIB
-
-Build gdbmexport with specified (static) library.  LIB must be
-a loader argument valid for the use with cc(1), e.g.: -lgdbm-1.8.
-
-** --gdbm183-libdir=DIR
-
-Build gdbmexport with the gdbm library from the specified directory.
-
-** --gdbm183-includedir=DIR
-
-Build gdbmexport with gdbm.h from the specified directory.
-
 ** --without-readline
 
 Don't compile GNU Readline support.  By default, configure enables
@@ -99,7 +81,7 @@ To track the development, visit
 
 * Copyright information:
 
-Copyright (C) 2011, 2016 Free Software Foundation, Inc.
+Copyright (C) 2011, 2016-2018 Free Software Foundation, Inc.
 
    Permission is granted to anyone to make or distribute verbatim copies
    of this document as received, in any medium, provided that the
diff --git a/configure.ac b/configure.ac
index 3511f0d..25c4ff4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,7 +17,7 @@
 
 m4_define([_GDBM_VERSION_MAJOR], 1)
 m4_define([_GDBM_VERSION_MINOR], 14)
-m4_define([_GDBM_VERSION_PATCH], 1)
+m4_define([_GDBM_VERSION_PATCH], 90)
 
 AC_INIT([gdbm],
         _GDBM_VERSION_MAJOR._GDBM_VERSION_MINOR[]m4_ifdef([_GDBM_VERSION_PATCH],._GDBM_VERSION_PATCH),
@@ -53,34 +53,6 @@ AC_ARG_ENABLE([libgdbm-compat],
 AC_ARG_VAR([COMPATINCLUDEDIR],[installation directory for dbm.h and ndbm.h])
 test -z "$COMPATINCLUDEDIR" && COMPATINCLUDEDIR='$(includedir)'
 
-AC_ARG_ENABLE([gdbm-export],
-  AC_HELP_STRING(
-    [--enable-gdbm-export],
-    [Build and install gdbmexport with specified gdbm 1.8 library. (Default is NO.)]),
-    [want_export=$enableval],
-    [want_export=no])
-
-AC_ARG_WITH([gdbm183-library],
-  AC_HELP_STRING(
-    [--with-gdbm183-library],
-    [Build gdbmexport with specified (static) library.]),
-    [GDBM183_LIBRARY=$withval],
-    [GDBM183_LIBRARY="-lgdbm"])
-
-AC_ARG_WITH([gdbm183-libdir],
-  AC_HELP_STRING(
-    [--with-gdbm183-libdir],
-    [Build gdbmexport with the gdbm library in the specified directory.]),
-    [GDBM183_LIBDIR=$withval],
-    [GDBM183_LIBDIR="/usr/local/lib"])
-
-AC_ARG_WITH([gdbm183-includedir],
-  AC_HELP_STRING(
-    [--with-gdbm183-includedir],
-    [Build gdbmexport with gdbm.h in the specified directory.]),
-    [GDBM183_INCLUDEDIR=$withval],
-    [GDBM183_INCLUDEDIR="/usr/local/include"])
-    
 dnl Check for programs
 AC_PROG_CC
 AC_PROG_CPP
@@ -132,11 +104,7 @@ AC_TYPE_OFF_T
 AC_CHECK_SIZEOF(off_t)
 AC_CHECK_MEMBERS([struct stat.st_blksize])
 
-AC_SUBST(GDBM183_LIBRARY)
-AC_SUBST(GDBM183_LIBDIR)
-AC_SUBST(GDBM183_INCLUDEDIR)
 AM_CONDITIONAL([COMPAT_OPT], [test "$want_compat" = yes])
-AM_CONDITIONAL([ENABLE_EXPORT], [test "$want_export" = yes])
 
 # Check for Curses libs.
 for lib in ncurses curses termcap
@@ -214,7 +182,6 @@ cat <<EOF
 GDBM settings summary:
 
 Compatibility library ......................... $status_compat
-Compatibility export tool ..................... $status_export
 Memory mapped I/O ............................. $mapped_io
 GNU Readline .................................. $status_readline
 Debugging support ............................. $status_debug
@@ -223,7 +190,6 @@ Debugging support ............................. $status_debug
 EOF
 ],
 [status_compat=$want_compat
-status_export=$want_export
 mapped_io=$mapped_io
 status_readline=$status_readline
 status_debug=$status_debug])
@@ -232,7 +198,6 @@ AC_CONFIG_FILES([Makefile
                  src/Makefile
                  src/gdbm.h
                  doc/Makefile
-                 compat/Makefile
-                 export/Makefile])
+                 compat/Makefile])
 
 AC_OUTPUT
diff --git a/doc/gdbm.texi b/doc/gdbm.texi
index 1631a6a..2aac1c3 100644
--- a/doc/gdbm.texi
+++ b/