+ AC_CACHE_CHECK([for nl_langinfo and YESEXPR], [gl_cv_langinfo_yesexpr],
+ [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <langinfo.h>]],
+ [[char* cs = nl_langinfo(YESEXPR); return !cs;]])],
+ [gl_cv_langinfo_yesexpr=yes],
+ [gl_cv_langinfo_yesexpr=no])
+ ])
+ if test $gl_cv_langinfo_yesexpr = yes; then
+ AC_DEFINE([HAVE_LANGINFO_YESEXPR], [1],
+ [Define if you have <langinfo.h> and nl_langinfo(YESEXPR).])
+ fi