/usr/share/aclocal/ax_check_mysqlr.m4 is in autoconf-archive 20170928-2.
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# https://www.gnu.org/software/autoconf-archive/ax_check_mysqlr.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_MYSQLR
#
# DESCRIPTION
#
# First check if mysqlconfig exists. It fails if mysqlconfig is not in
# path. Then it checks for the libraries and replaces -lmysqlclient
# statement with -lmysqlclient_r statement, to enable threaded client
# library.
#
# The following are exported environment variables:
#
# MYSQL_LIBS
# MYSQL_CFLAGS
#
# LICENSE
#
# Copyright (c) 2008 Can Bican <bican@yahoo.com>
#
# 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 6
AU_ALIAS([AC_CHECK_MYSQLR], [AX_CHECK_MYSQLR])
AC_DEFUN([AX_CHECK_MYSQLR],[
AC_PATH_PROG(mysqlconfig,mysql_config)
if test [ -z "$mysqlconfig" ]
then
AC_MSG_ERROR([mysql_config executable not found])
else
AC_MSG_CHECKING(mysql libraries)
MYSQL_LIBS=`${mysqlconfig} --libs | sed -e \
's/-lmysqlclient /-lmysqlclient_r /' -e 's/-lmysqlclient$/-lmysqlclient_r/'`
AC_MSG_RESULT($MYSQL_LIBS)
AC_MSG_CHECKING(mysql includes)
MYSQL_CFLAGS=`${mysqlconfig} --cflags`
AC_MSG_RESULT($MYSQL_CFLAGS)
fi
])
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