+AC_DEFUN([DX_EXPORTED_SH],
+[AC_REQUIRE([DX_INIT])dnl
+AC_REQUIRE([AC_PROG_SED])dnl
+
+AC_CONFIG_COMMANDS_PRE(
+[AC_PROVIDE_IFELSE([LT_INIT], , [m4_warn([syntax],
+[$0 requires libtool.
+Consider adding an invocation of LT_INIT to configure.ac.])])
+
+GLOBAL_SYMBOL_PIPE=$lt_cv_sys_global_symbol_pipe
+AC_SUBST([GLOBAL_SYMBOL_PIPE])])