/usr/share/aclocal/ax_count_cpus.m4 is in autoconf-archive 20110917-1.
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# http://www.gnu.org/software/autoconf-archive/ax_count_cpus.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_COUNT_CPUS
#
# DESCRIPTION
#
# Attempt to count the number of processors present on the machine. If the
# detection fails, then a value of 1 is assumed.
#
# The value is placed in the CPU_COUNT variable.
#
# LICENSE
#
# Copyright (c) 2008 Michael Paul Bailey <jinxidoru@byu.net>
# Copyright (c) 2008 Christophe Tournayre <turn3r@users.sourceforge.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_COUNT_CPUS], [
AC_REQUIRE([AC_PROG_EGREP])
AC_MSG_CHECKING(the number of available CPUs)
CPU_COUNT="0"
#On MacOS
if test -x /usr/sbin/sysctl -a `/sbin/sysctl -a 2>/dev/null| grep -c hw.cpu`; then
CPU_COUNT=`/usr/sbin/sysctl -n hw.ncpu`
fi
#On Linux
if test "x$CPU_COUNT" = "x0" -a -e /proc/cpuinfo; then
CPU_COUNT=`$EGREP -c '^processor' /proc/cpuinfo`
fi
if test "x$CPU_COUNT" = "x0"; then
CPU_COUNT="1"
AC_MSG_RESULT( [unable to detect (assuming 1)] )
else
AC_MSG_RESULT( $CPU_COUNT )
fi
])
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