/usr/share/aclocal/ax_check_uname_syscall.m4 is in autoconf-archive 20140228-1.1.
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# http://www.gnu.org/software/autoconf-archive/ax_check_uname_syscall.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_UNAME_SYSCALL
#
# DESCRIPTION
#
# Check that the POSIX compliant uname(2) call works properly.
#
# LICENSE
#
# Copyright (c) 2008 Bruce Korb <bkorb@gnu.org>
#
# 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 5
AU_ALIAS([AG_CHECK_UNAME_SYSCALL], [AX_CHECK_UNAME_SYSCALL])
AC_DEFUN([AX_CHECK_UNAME_SYSCALL],[
AC_MSG_CHECKING([whether uname(2) is POSIX])
AC_CACHE_VAL([ax_cv_uname_syscall],[
AC_TRY_RUN([#include <sys/utsname.h>
int main() { struct utsname unm;
return uname( &unm ); }],[ax_cv_uname_syscall=yes],[ax_cv_uname_syscall=no],[ax_cv_uname_syscall=no]
) # end of TRY_RUN]) # end of CACHE_VAL
AC_MSG_RESULT([$ax_cv_uname_syscall])
if test x$ax_cv_uname_syscall = xyes
then
AC_DEFINE(HAVE_UNAME_SYSCALL, 1,
[Define this if uname(2) is POSIX])
fi
]) # end of AC_DEFUN of AX_CHECK_UNAME_SYSCALL
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