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diff --git a/m4/ax_lib_postgresql.m4 b/m4/ax_lib_postgresql.m4
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+# ===========================================================================
+#     http://www.gnu.org/software/autoconf-archive/ax_lib_postgresql.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_LIB_POSTGRESQL([MINIMUM-VERSION])
+#
+# DESCRIPTION
+#
+#   This macro provides tests of availability of PostgreSQL 'libpq' library
+#   of particular version or newer.
+#
+#   AX_LIB_POSTGRESQL macro takes only one argument which is optional. If
+#   there is no required version passed, then macro does not run version
+#   test.
+#
+#   The --with-postgresql option takes one of three possible values:
+#
+#   no - do not check for PostgreSQL client library
+#
+#   yes - do check for PostgreSQL library in standard locations (pg_config
+#   should be in the PATH)
+#
+#   path - complete path to pg_config utility, use this option if pg_config
+#   can't be found in the PATH
+#
+#   This macro calls:
+#
+#     AC_SUBST(POSTGRESQL_CPPFLAGS)
+#     AC_SUBST(POSTGRESQL_LDFLAGS)
+#     AC_SUBST(POSTGRESQL_VERSION)
+#
+#   And sets:
+#
+#     HAVE_POSTGRESQL
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Mateusz Loskot <mateusz@loskot.net>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 9
+
+AC_DEFUN([AX_LIB_POSTGRESQL],
+[
+    AC_ARG_WITH([postgresql],
+        AS_HELP_STRING([--with-postgresql=@<:@ARG@:>@],
+            [use PostgreSQL library @<:@default=yes@:>@, optionally specify path to pg_config]
+        ),
+        [
+        if test "$withval" = "no"; then
+            want_postgresql="no"
+        elif test "$withval" = "yes"; then
+            want_postgresql="yes"
+        else
+            want_postgresql="yes"
+            PG_CONFIG="$withval"
+        fi
+        ],
+        [want_postgresql="yes"]
+    )
+
+    POSTGRESQL_CPPFLAGS=""
+    POSTGRESQL_LDFLAGS=""
+    POSTGRESQL_VERSION=""
+
+    dnl
+    dnl Check PostgreSQL libraries (libpq)
+    dnl
+
+    if test "$want_postgresql" = "yes"; then
+
+        if test -z "$PG_CONFIG" -o test; then
+            AC_PATH_PROG([PG_CONFIG], [pg_config], [])
+        fi
+
+        if test ! -x "$PG_CONFIG"; then
+            dnl AC_MSG_ERROR([$PG_CONFIG does not exist or it is not an executable file])
+            PG_CONFIG="no"
+            found_postgresql="no"
+        fi
+
+        if test "$PG_CONFIG" != "no"; then
+            AC_MSG_CHECKING([for PostgreSQL libraries])
+
+            POSTGRESQL_CPPFLAGS="-I`$PG_CONFIG --includedir`"
+            POSTGRESQL_LDFLAGS="-L`$PG_CONFIG --libdir`"
+
+            POSTGRESQL_VERSION=`$PG_CONFIG --version | sed -e 's#PostgreSQL ##' | awk '{print $1}'`
+
+            AC_DEFINE([HAVE_POSTGRESQL], [1],
+                [Define to 1 if PostgreSQL libraries are available])
+
+            found_postgresql="yes"
+            AC_MSG_RESULT([yes])
+        else
+            found_postgresql="no"
+            AC_MSG_RESULT([no])
+        fi
+    fi
+
+    dnl
+    dnl Check if required version of PostgreSQL is available
+    dnl
+
+
+    postgresql_version_req=ifelse([$1], [], [], [$1])
+
+    if test "$found_postgresql" = "yes" -a -n "$postgresql_version_req"; then
+
+        AC_MSG_CHECKING([if PostgreSQL version $POSTGRESQL_VERSION is >= $postgresql_version_req])
+
+        dnl Decompose required version string of PostgreSQL
+        dnl and calculate its number representation
+        postgresql_version_req_major=`expr $postgresql_version_req : '\([[0-9]]*\)'`
+        postgresql_version_req_minor=`expr $postgresql_version_req : '[[0-9]]*\.\([[0-9]]*\)'`
+        postgresql_version_req_micro=`expr $postgresql_version_req : '[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)'`
+        if test "x$postgresql_version_req_micro" = "x"; then
+            postgresql_version_req_micro="0"
+        fi
+
+        postgresql_version_req_number=`expr $postgresql_version_req_major \* 1000000 \
+                                   \+ $postgresql_version_req_minor \* 1000 \
+                                   \+ $postgresql_version_req_micro`
+
+        dnl Decompose version string of installed PostgreSQL
+        dnl and calculate its number representation
+        postgresql_version_major=`expr $POSTGRESQL_VERSION : '\([[0-9]]*\)'`
+        postgresql_version_minor=`expr $POSTGRESQL_VERSION : '[[0-9]]*\.\([[0-9]]*\)'`
+        postgresql_version_micro=`expr $POSTGRESQL_VERSION : '[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)'`
+        if test "x$postgresql_version_micro" = "x"; then
+            postgresql_version_micro="0"
+        fi
+
+        postgresql_version_number=`expr $postgresql_version_major \* 1000000 \
+                                   \+ $postgresql_version_minor \* 1000 \
+                                   \+ $postgresql_version_micro`
+
+        postgresql_version_check=`expr $postgresql_version_number \>\= $postgresql_version_req_number`
+        if test "$postgresql_version_check" = "1"; then
+            AC_MSG_RESULT([yes])
+        else
+            AC_MSG_RESULT([no])
+        fi
+    fi
+
+    AC_SUBST([POSTGRESQL_VERSION])
+    AC_SUBST([POSTGRESQL_CPPFLAGS])
+    AC_SUBST([POSTGRESQL_LDFLAGS])
+])