diff --git a/src/configure b/src/configure
index b885d665c..90041ffbe 100755
--- a/src/configure
+++ b/src/configure
@@ -1,7 +1,7 @@
 #! /bin/sh
 # From configure.ac Revision.
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.69 for ecl 16.1.2-rc3.
+# Generated by GNU Autoconf 2.69 for ecl 16.1.2-rc4.
 #
 #
 # Copyright (C) 1992-1996, 1998-2012 Free Software Foundation, Inc.
@@ -578,8 +578,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='ecl'
 PACKAGE_TARNAME='ecl'
-PACKAGE_VERSION='16.1.2-rc3'
-PACKAGE_STRING='ecl 16.1.2-rc3'
+PACKAGE_VERSION='16.1.2-rc4'
+PACKAGE_STRING='ecl 16.1.2-rc4'
 PACKAGE_BUGREPORT=''
 PACKAGE_URL=''
 
@@ -1366,7 +1366,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures ecl 16.1.2-rc3 to adapt to many kinds of systems.
+\`configure' configures ecl 16.1.2-rc4 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1435,7 +1435,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of ecl 16.1.2-rc3:";;
+     short | recursive ) echo "Configuration of ecl 16.1.2-rc4:";;
    esac
   cat <<\_ACEOF
 
@@ -1611,7 +1611,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-ecl configure 16.1.2-rc3
+ecl configure 16.1.2-rc4
 generated by GNU Autoconf 2.69
 
 Copyright (C) 2012 Free Software Foundation, Inc.
@@ -2198,7 +2198,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by ecl $as_me 16.1.2-rc3, which was
+It was created by ecl $as_me 16.1.2-rc4, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   $ $0 $@
@@ -10209,7 +10209,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by ecl $as_me 16.1.2-rc3, which was
+This file was extended by ecl $as_me 16.1.2-rc4, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -10271,7 +10271,7 @@ _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-ecl config.status 16.1.2-rc3
+ecl config.status 16.1.2-rc4
 configured by $0, generated by GNU Autoconf 2.69,
   with options \\"\$ac_cs_config\\"
 
diff --git a/src/configure.ac b/src/configure.ac
index 9f925ce3d..e96d84c08 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -8,7 +8,7 @@ dnl  AUTOCONF configuration for ECL
 dnl  Giuseppe Attardi 25.1.1994
 dnl
 
-AC_INIT([ecl],[16.1.2-rc3],[])
+AC_INIT([ecl],[16.1.2-rc4],[])
 AC_REVISION([$Revision$])
 AC_CONFIG_SRCDIR([bare.lsp.in])
 AC_CONFIG_AUX_DIR([gmp])