##### http://autoconf-archive.cryp.to/ax_lib_postgresql.html
# AX_LIB_POSTGRESQL([MINIMUM-VERSION])
# 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
# 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
# AC_SUBST(POSTGRESQL_CFLAGS)
# AC_SUBST(POSTGRESQL_LDFLAGS)
# AC_SUBST(POSTGRESQL_LIBS)
# AC_SUBST(POSTGRESQL_VERSION)
# 2017-09-26 modified version detection to detect PostgreSQL 10 (Zabbix)
# Copyright (c) 2006 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.
AC_DEFUN([AX_LIB_POSTGRESQL],
AC_ARG_WITH([postgresql],
AS_HELP_STRING([--with-postgresql@<:@=ARG@:>@],
[use PostgreSQL library @<:@default=no@:>@, optionally specify path to pg_config]
if test "x$withval" = "xno"; then
elif test "x$withval" = "xyes"; then