+# additional suffixes of archive filename.
+AC_MSG_CHECKING(additional suffixes of archive filename)
+AC_ARG_WITH(additional-suffixes,
+ [AC_HELP_STRING([[[--with-additional-suffixes=foo,bar]]],
+ [additional suffixes of archive filename, default is empty string])],
+ ,
+ with_additional_suffixes="")
+
+AC_MSG_RESULT($with_additional_suffixes)
+AC_DEFINE_UNQUOTED(ADDITIONAL_SUFFIXES, "$with_additional_suffixes",
+ [Define to comma separated suffixes list if you wish to regard it as implicit archive suffixes.])
+
+case $host_os in
+*msdosdjgpp*)
+CFLAGS="$CFLAGS -DNOT_COMPATIBLE_MODE"
+;;
+esac
+