/usr/share/aclocal/ax_check_postgres_db.m4 is in autoconf-archive 20140228-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# http://www.gnu.org/software/autoconf-archive/ax_check_postgres_db.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_POSTGRES_DB([ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
#
# DESCRIPTION
#
# This macro tries to find the headers and libraries for the PostgreSQL
# database to build client applications.
#
# If includes are found, the variable PQINCPATH will be set, and
# have_pqinc will be 'yes'. If libraries are found, the variable PQLIBPATH
# will be set, and have_pqlib will be 'yes'. If both PQINCPATH and
# PQLIBPATH are found, HAVE_LIBPQ will be set to 'yes' (and AC_DEFINEd),
# and -lpq will be added to the beginning of LIBS. If their respective
# conditions are not met, have_pqinc, have_pqlib, HAVE_LIBPQ, will be
# 'no'.
#
# This macro does fails if either the headers or the library are not
# found, unless ACTION-IF-NOT-FOUND is not empty. When both are found,
# ACTION-IF-FOUND, if defined, is exectued after the variables have been
# defined. If --with-pgsql=no (or equivalents) is given, nothing happens.
#
# An automake conditional can be subsequently defined as
#
# AM_CONDITIONAL([HAVE_LIBPQ], [test x$HAVE_LIBPQ = x$yes])
#
# in configure.ac.
#
# LICENSE
#
# Copyright (c) 2008 Christian Toepp <c.toepp@gmail.com>
# Copyright (c) 2012 Olivier Mehani <shtrom-ax@ssji.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
AU_ALIAS([CT_CHECK_POSTGRES_DB], [AX_CHECK_POSTGRES_DB])
AC_DEFUN([AX_CHECK_POSTGRES_DB], [
pushdef([ACTION_IF_FOUND],$1)
pushdef([ACTION_IF_NOT_FOUND],$2)
AC_ARG_WITH(pgsql,
[AS_HELP_STRING([--with-pgsql[[=PREFIX]]],
[Prefix of your PostgreSQL installation @<:@PREFIX@:>@])],
[pg_prefix=$withval], [pg_prefix=])
AC_ARG_WITH(pgsql-inc,
[AS_HELP_STRING([--with-pgsql-inc=[[PATH]]],
[Path to the include directory of PostgreSQL @<:@INCLUDEDIR@:>@])],
[pg_inc=$withval], [pg_inc=])
AC_ARG_WITH(pgsql-lib,
[AS_HELP_STRING([--with-pgsql-lib=[[PATH]]],
[Path to the libraries of PostgreSQL @<:@LIBDIR@:>@])],
[pg_lib=$withval], [pg_lib=])
have_pqinc=no
have_pqlib=no
HAVE_LIBPQ=no
AS_IF([test "$pg_prefix" != "no"],[
AS_IF([test "$pg_prefix" != "yes" && test "$pg_prefix" != ""], [
PQINCPATH="-I$pg_prefix/include $PQINCPATH"
PQLIBPATH="-L$pg_prefix/lib $PQLIBPATH"
])
AS_IF([test "$pg_inc" != ""], [PQINCPATH="-I$pg_inc $PQINCPATH"])
AS_IF([test "$pg_lib" != ""], [PQLIBPATH="-L$pg_lib $PQLIBPATH"])
oldCPPFLAGS=$CPPFLAGS
oldLDFLAGS=$LDFLAGS
CPPFLAGS="$PQINCPATH $CPPFLAGS"
LDFLAGS="$PQLIBPATH $LDFLAGS"
AC_CHECK_HEADER([libpq-fe.h], [have_pqinc=yes])
AC_CHECK_LIB([pq], [PQconnectdb], [
dnl We only search for libpq, so we know why we're here
LIBPQ_LIBS=-lpq
have_pqlib=yes
])
HAVE_LIBPQ=`(test x$have_pqinc = xyes && test x$have_pqlib = xyes && echo yes) || echo no`
CPPFLAGS=$oldCPPFLAGS
LDFLAGS=$oldLDFLAGS
AC_SUBST(PQINCPATH)
AC_SUBST(PQLIBPATH)
AC_SUBST(LIBPQ_LIBS)
AS_IF([test x$HAVE_LIBPQ = xyes],[
AC_DEFINE([HAVE_LIBPQ], [1], [Define if libpq is installed])
ACTION_IF_FOUND
],
[m4_ifset([ACTION_IF_NOT_FOUND],[ACTION_IF_NOT_FOUND],
[AC_MSG_ERROR(some support files for PostgreSQL were missing)])])
])
popdef([ACTION_IF_FOUND])
popdef([ACTION_IF_NOT_FOUND])
])
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