V6.2_and_Higher

   The following additional functions are available on OpenVMS VAX
   and OpenVMS Alpha Version 6.2 and higher:

      catclose     catgets      catopen      fgetwc
      fgetws       fputwc       fputws       getopt
      getwc        getwchar     iconv        iconv_close
      iconv_open   iswalnum     iswalpha     iswcntrl
      iswctype     iswdigit     iswgraph     iswlower
      iswprint     iswpunct     iswspace     iswupper
      iswxdigit    nl_langinfo  putwc        putwchar
      strnlen      strptime     towlower     towupper
      ungetwc      wcscat       wcschr       wcscmp
      wcscoll      wcscpy       wcscspn      wcsftime
      wcslen       wcsncat      wcsncmp      wcsncpy
      wcspbrk      wcsrchr      wcsspn       wcstol
      wcstoul      wcswcs       wcswidth     wcsxfrm
      wcstod       wctype       wcwidth      wcstok