/usr/share/aclocal/ax_am_jobserver.m4 is in autoconf-archive 20170928-2.
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# https://www.gnu.org/software/autoconf-archive/ax_am_jobserver.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_AM_JOBSERVER([default_value])
#
# DESCRIPTION
#
# Enables the use of make's jobserver for the purpose of parallel building
# by passing the -j option to make.
#
# The option --enable-jobserver is added to configure which can accept a
# yes, no, or an integer. The integer is the number of separate jobs to
# allow. If 'yes' is given, then the is assumed to be one more than the
# number of CPUs (determined through AX_COUNT_CPUS). If the value of no is
# given, then the jobserver is disabled. The default value is given by the
# first argument of the macro, or 'yes' if the argument is omitted.
#
# This macro makes use of AX_AM_MACROS, so you must add the following line
#
# @INC_AMINCLUDE@
#
# to your Makefile.am files.
#
# LICENSE
#
# Copyright (c) 2008 Michael Paul Bailey <jinxidoru@byu.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 8
AC_DEFUN([AX_AM_JOBSERVER], [
AC_REQUIRE([AX_COUNT_CPUS])
AC_REQUIRE([AX_AM_MACROS])
AC_ARG_ENABLE( jobserver,
[ --enable-jobserver@<:@=no/yes/@%:@@:>@ default=m4_ifval([$1],[$1],[yes])
Enable up to @%:@ make jobs
yes: enable one more than CPU count
],, [enable_jobserver=m4_ifval([$1],[$1],[yes])])
if test "x$enable_jobserver" = "xyes"; then
enable_jobserver=$CPU_COUNT
((enable_jobserver++))
fi
m4_pattern_allow(AM_MAKEFLAGS)
if test "x$enable_jobserver" != "xno"; then
AC_MSG_NOTICE([added jobserver support to make for $enable_jobserver jobs])
AX_ADD_AM_MACRO( AM_MAKEFLAGS += -j$enable_jobserver )
fi
])
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