UCS-4 seems to be more portable than WCHAR_T.

SVN revision: 27304

configure.in

@@ -68,6 +68,7 @@ AC_C_INLINE
 AC_C___ATTRIBUTE__
 AC_CHECK_SIZEOF(int, 4)
 AC_CHECK_SIZEOF(long, 4)
+AC_CHECK_SIZEOF(wchar_t, 4)
 
 AC_CHECK_FUNCS(getcwd)
 AC_CHECK_FUNCS(mkdir)

src/lang.c

@@ -164,8 +164,13 @@ EwcOpen(int utf8)
    else
       enc = nl_langinfo(CODESET);
 
+#if SIZEOF_WCHAR_T == 4
+   iconv_cd_str2wcs = iconv_open("UCS-4", enc);
+   iconv_cd_wcs2str = iconv_open(enc, "UCS-4");
+#else
    iconv_cd_str2wcs = iconv_open("WCHAR_T", enc);
    iconv_cd_wcs2str = iconv_open(enc, "WCHAR_T");
+#endif
 
    if (iconv_cd_str2wcs != BAD_CD && iconv_cd_wcs2str != BAD_CD)
       return 0;