From: t-ishii@sra.co.jp

Included are patches intended for allowing PostgreSQL to handle
multi-byte charachter sets such as EUC(Extende Unix Code), Unicode and
Mule internal code. With the MB patch you can use multi-byte character
sets in regexp and LIKE. The encoding system chosen is determined at
the compile time.

To enable the MB extension, you need to define a variable "MB" in
Makefile.global or in Makefile.custom. For further information please
take a look at README.mb under doc directory.

(Note that unlike "jp patch" I do not use modified GNU regexp any
more. I changed Henry Spencer's regexp coming with PostgreSQL.)

src/include/regex/utils.h

@@ -42,7 +42,12 @@
 /* utility definitions */
 #define DUPMAX			100000000		/* xxx is this right? */
 #define INFINITY		(DUPMAX + 1)
+
+#ifdef MB
+#define NC				(SHRT_MAX - SHRT_MIN + 1)
+#else
 #define NC				(CHAR_MAX - CHAR_MIN + 1)
+#endif
 typedef unsigned char uch;
 
 /* switch off assertions (if not already off) if no REDEBUG */