Change "CATEGORIES+=" to "CATEGORIES=" in sample Makefiles. It was

"+=" originally because (as I understand) Jordan used a sed script (or
was it perl?) to edit all the ports Makefiles automatically and he
wanted to make sure multiple CATEGORIES lines (they were inserted
after DISTNAME or something, there shouldn't have been multiple of
them to begin with but that's another story) won't be stepping on each
other's toes.

Reminded by:	obrien

handbook/porting.sgml

@@ -1,4 +1,4 @@
-<!-- $Id: porting.sgml,v 1.37 1996-11-07 15:07:00 max Exp $ -->
+<!-- $Id: porting.sgml,v 1.38 1996-11-11 06:50:44 asami Exp $ -->
 <!-- The FreeBSD Documentation Project -->
 
 <sect1><heading>Porting an existing piece of free software<label id="porting"></heading>
@@ -161,7 +161,7 @@ The pattern is the year followed by the month.
  #
  
  DISTNAME=	oneko-1.1b
- CATEGORIES+=	games
+ CATEGORIES=	games
  MASTER_SITES=	ftp://ftp.cs.columbia.edu/archives/X11R5/contrib/
  
  MAINTAINER=	asami@FreeBSD.ORG
@@ -1159,7 +1159,7 @@ lib/libtcl.so.7.3
   and then MASTER_SITES, and optionally EXTRACT_SUFX or DISTFILES]
  DISTNAME=	xdvi
  PKGNAME=	xdvi-pl18
- CATEGORIES+=	print
+ CATEGORIES=	print
  [do not forget the trailing slash ("/")!]
  MASTER_SITES=	ftp://crl.dec.com/pub/X11/contrib/applications/
  [set this if the source is not in the standard ".tar.gz" form]