Put [] around default value for port number.

configure

@@ -880,7 +880,7 @@ Optional Packages:
   --with-includes=DIRS    look for additional header files in DIRS
   --with-libraries=DIRS   look for additional libraries in DIRS
   --with-libs=DIRS        alternative spelling of --with-libraries
-  --with-pgport=PORTNUM   change default port number 5432
+  --with-pgport=PORTNUM   change default port number [5432]
   --with-tcl              build Tcl modules (PL/Tcl)
   --with-tclconfig=DIR    tclConfig.sh is in DIR
   --with-perl             build Perl modules (PL/Perl)

configure.in

 dnl Process this file with autoconf to produce a configure script.
-dnl $PostgreSQL: pgsql/configure.in,v 1.436 2005/12/06 18:35:09 momjian Exp $
+dnl $PostgreSQL: pgsql/configure.in,v 1.437 2005/12/08 21:29:25 petere Exp $
 dnl
 dnl Developers, please strive to achieve this order:
 dnl
@@ -166,7 +166,7 @@ AC_SUBST(WANTED_LANGUAGES)
 # Default port number (--with-pgport), default 5432
 #
 AC_MSG_CHECKING([for default port number])
-PGAC_ARG_REQ(with, pgport, [  --with-pgport=PORTNUM   change default port number [5432]],
+PGAC_ARG_REQ(with, pgport, [  --with-pgport=PORTNUM   change default port number [[5432]]],
              [default_port=$withval],
              [default_port=5432])
 AC_MSG_RESULT([$default_port])