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+# ===========================================================================
+# SYNOPSIS
+#
+# AX_NAGIOS_GET_OS
+#
+# DESCRIPTION
+#
+# This macro determines the operating system of the computer it is run on.
+#
+# LICENSE
+#
+# Copyright (c) 2016 Nagios Core Development Team
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation; either version 2 of the License, or (at your
+# option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+# Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+# As a special exception, the respective Autoconf Macro's copyright owner
+# gives unlimited permission to copy, distribute and modify the configure
+# scripts that are the output of Autoconf when processing the Macro. You
+# need not follow the terms of the GNU General Public License when using
+# or distributing such scripts, even though portions of the text of the
+# Macro appear in them. The GNU General Public License (GPL) does govern
+# all other use of the material that constitutes the Autoconf Macro.
+#
+# This special exception to the GPL applies to versions of the Autoconf
+# Macro released by the Autoconf Archive. When you make and distribute a
+# modified version of the Autoconf Macro, you may extend this special
+# exception to the GPL to apply to your modified version as well.
+# ===========================================================================
+
+AU_ALIAS([AC_NAGIOS_GET_OS], [AX_NAGIOS_GET_OS])
+AC_DEFUN([AX_NAGIOS_GET_OS],
+[
+
+AC_SUBST(opsys)
+AC_SUBST(arch)
+
+#
+# Get user hints
+#
+ AC_MSG_CHECKING(what the operating system is )
+ AC_ARG_WITH(opsys, AC_HELP_STRING([--with-opsys=OS],
+ [specify operating system (linux, osx, bsd, solaris, irix, cygwin,
+ aix, hp-ux, etc.)]),
+ [
+ #
+ # Run this if --with was specified
+ #
+ if test "x$withval" = x -o x$withval = xno; then
+ opsys_wanted=yes
+ else
+ opsys_wanted=no
+ opsys="$withval"
+ AC_MSG_RESULT($opsys)
+ fi
+ ], [
+ #
+ # Run this if --with was not specified
+ #
+ opsys_wanted=yes
+ ])
+
+ if test x$opsys = xno; then
+ opsys=""
+ opsys_wanted=yes
+ elif test x$opsys = xyes; then
+ AC_MSG_ERROR([you must enter an O/S type if '--with-opsys' is specified])
+ fi
+
+ #
+ # Determine operating system if it wasn't supplied
+ #
+ if test $opsys_wanted=yes; then
+ opsys=`uname -s | tr ["[A-Z]" "[a-z]"]`
+ if test x"$opsys" = "x"; then opsys="unknown"; fi
+ AS_CASE([$opsys],
+ [darwin*], opsys="osx",
+ [*bsd*], opsys="bsd",
+ [dragonfly], opsys="bsd",
+ [sunos], opsys="solaris",
+ [gnu/hurd], opsys="linux",
+ [irix*], opsys="irix",
+ [cygwin*], opsys="cygwin",
+ [mingw*], opsys="mingw",
+ [msys*], opsys="msys")
+ fi
+
+ arch=`uname -m | tr ["[A-Z]" "[a-z]"]`
+
+ AC_MSG_RESULT($opsys)
+])