AC_DEFUN([AC_FUNC_LOCALE_WORKS],
[AC_CACHE_CHECK([if setlocale() and nl_langinfo() works],
	ac_cv_locale_works, [
	AC_TRY_RUN([
#include <locale.h>
#include <langinfo.h>
int main ()
{
  char* cs;
  setlocale(LC_CTYPE, "");
  cs = nl_langinfo(CODESET);
  return !cs;
}
],
		ac_cv_locale_works=yes,
		ac_cv_locale_works=no,
		ac_cv_locale_works=no)
	])
if test "$ac_cv_locale_works" = "yes"; then
  AC_DEFINE(LOCALE_WORKS, 1, [Define if setlocale() and nl_langinfo() work.])
fi])