+AC_CHECK_FUNCS(setreuid getrusage vtimes)
+
+dnl --- Set default become style ---
+
+AC_ARG_ENABLE([style],
+[ --enable-style=STYLE set default style to preserve, su, or login],
+[case "$withval" in
+ preserve) style="l_preserve" ;;
+ su|user) style="l_user" ;;
+ login) style="l_login" ;;
+esac],
+[style="l_preserve"])
+AC_DEFINE_UNQUOTED(DEFAULT_LOGIN_STYLE, $style)