AC_DEFUN(PSI_CHECK_WCHAR, [ AC_CHECK_HEADERS(wchar.h) PSI_TYPE(wint_t, int) PSI_CONST(WINT_MIN, int) PSI_CONST(WINT_MAX, int) PSI_CONST(WEOF, int) PSI_DECL(int wprintf, [(wchar_t *format)], vararg) PSI_DECL(int fwprintf, [(FILE *stream, wchar_t *format)], vararg) PSI_DECL(int swprintf, [(wchar_t *wcs, size_t maxlen, wchar_t *format)], vararg) ])