+dnl AT_SIGPIPE_PREREQ - Skip test unless SIGPIPE handling is the default
+m4_define([AT_SIGPIPE_PREREQ],[
+case `(cat "$at_myself" 2>&3 | :) 3>&1 >/dev/null` in #(
+?*) AT_SKIP_TEST;;
+esac
+])
+
+dnl AT_SORT_PREREQ - Skip test if sort utility outputs unwanted data on stderr
+m4_define([AT_SORT_PREREQ],[
+test -z "`sort < /dev/null 2>&1`" || AT_SKIP_TEST
+])
+
+dnl AT_UNPRIVILEGED_PREREQ - Skip test if running at root privileges
+m4_define([AT_UNPRIVILEGED_PREREQ],[
+echo "test" > $[]$
+chmod 0 $[]$
+cat $[]$ > /dev/null 2>&1
+result=$?
+rm -f $[]$
+test $result -eq 0 && AT_SKIP_TEST
+])
+
+dnl AT_PRIVILEGED_PREREQ - Skip test if not running at root privileges
+m4_define([AT_PRIVILEGED_PREREQ],[
+echo "test" > $[]$
+chmod 0 $[]$
+cat $[]$ > /dev/null 2>&1
+result=$?
+rm -f $[]$
+test $result -eq 0 || AT_SKIP_TEST
+])
+
+m4_define([AT_TAR_MKHIER],[
+install-sh -d $1 >/dev/null dnl
+m4_if([$2],,,&& genfile --file [$1]/[$2]) || AT_SKIP_TEST])
+
+m4_include([sparsemvp.at])
+