configure.in:

  ./configure --with-charset=binary
  is now possible.

configure.in

@@ -2336,6 +2336,7 @@ dnl you must also create strings/ctype-$charset_name.c
 
 AC_DIVERT_PUSH(0)
 
+define(CHARSETS_AVAILABLE0,binary)
 define(CHARSETS_AVAILABLE1,ascii armscii8 ascii big5 cp1250 cp1251 cp1256 cp1257)
 define(CHARSETS_AVAILABLE2,cp850 cp852 cp866 dec8 euckr gb2312 gbk geostd8)
 define(CHARSETS_AVAILABLE3,greek hebrew hp8 keybcs2 koi8r koi8u)
@@ -2343,7 +2344,7 @@ define(CHARSETS_AVAILABLE4,latin1 latin2 latin5 latin7 macce macroman)
 define(CHARSETS_AVAILABLE5,sjis swe7 tis620 ucs2 ujis utf8)
 
 DEFAULT_CHARSET=latin1
-CHARSETS_AVAILABLE="CHARSETS_AVAILABLE1 CHARSETS_AVAILABLE2 CHARSETS_AVAILABLE3 CHARSETS_AVAILABLE4 CHARSETS_AVAILABLE5"
+CHARSETS_AVAILABLE="CHARSETS_AVAILABLE0 CHARSETS_AVAILABLE1 CHARSETS_AVAILABLE2 CHARSETS_AVAILABLE3 CHARSETS_AVAILABLE4 CHARSETS_AVAILABLE5"
 CHARSETS_COMPLEX="big5 cp1250 euckr gb2312 gbk latin1 latin2 sjis tis620 ucs2 ujis utf8"
 
 AC_DIVERT_POP
@@ -2351,6 +2352,7 @@ AC_DIVERT_POP
 AC_ARG_WITH(charset,
    [  --with-charset=CHARSET
                           Default character set, use one of:
+                          CHARSETS_AVAILABLE0
                           CHARSETS_AVAILABLE1
                           CHARSETS_AVAILABLE2
                           CHARSETS_AVAILABLE3