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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) 2012 Brian Aker <brian@tangent.org>
+# 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 10
+
+ AC_DEFUN([AX_COUNT_CPUS],[
+ AC_REQUIRE([AC_CANONICAL_HOST])
+ AC_REQUIRE([AC_PROG_EGREP])
+ AC_MSG_CHECKING([the number of available CPUs])
+ CPU_COUNT="0"
+
+ AS_CASE([$host_os],[
+ *darwin*],[
+ AS_IF([test -x /usr/sbin/sysctl],[
+ sysctl_a=`/usr/sbin/sysctl -a 2>/dev/null| grep -c hw.cpu`
+ AS_IF([test sysctl_a],[
+ CPU_COUNT=`/usr/sbin/sysctl -n hw.ncpu`
+ ])
+ ])],[
+ *linux*],[
+ AS_IF([test "x$CPU_COUNT" = "x0" -a -e /proc/cpuinfo],[
+ AS_IF([test "x$CPU_COUNT" = "x0" -a -e /proc/cpuinfo],[
+ CPU_COUNT=`$EGREP -c '^processor' /proc/cpuinfo`
+ ])
+ ])
+ ])
+
+ AS_IF([test "x$CPU_COUNT" = "x0"],[
+ CPU_COUNT="1"
+ AC_MSG_RESULT( [unable to detect (assuming 1)] )
+ ],[
+ AC_MSG_RESULT( $CPU_COUNT )
+ ])
+ ])