NetBSD/gnu/dist/tar/m4/mbrtowc.m4

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#serial 4
dnl From Paul Eggert
AC_DEFUN([jm_FUNC_MBRTOWC],
[
AC_CACHE_CHECK([whether mbrtowc and mbstate_t are properly declared],
jm_cv_func_mbrtowc,
[AC_TRY_LINK(
[#include <wchar.h>],
[mbstate_t state; return ! (sizeof state && mbrtowc);],
jm_cv_func_mbrtowc=yes,
jm_cv_func_mbrtowc=no)])
if test $jm_cv_func_mbrtowc = yes; then
AC_DEFINE(HAVE_MBRTOWC, 1,
[Define to 1 if mbrtowc and mbstate_t are properly declared.])
fi
])