ports/147131: [patch] textproc/xmlto: use `?=' for *_CMD like Mk/bsd.commands.mk does

[Anonymous]

>Number:         147131
>Category:       ports
>Synopsis:       [patch] textproc/xmlto: use `?=' for *_CMD like Mk/bsd.commands.mk does
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Thu May 27 13:30:04 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Anonymous
>Release:        FreeBSD 9.0-CURRENT amd64
>Organization:
>Environment:
bash is a symlink to zsh
BASH_CMD=$HOME/.bin/bash
>Description:
Allow overriding *_CMD variables in make.conf. Since make.conf is read
after Makefile use weak `?='.
>How-To-Repeat:
>Fix:
--- a.diff begins here ---
Index: textproc/xmlto/Makefile
===================================================================
RCS file: /a/.cvsup/ports/textproc/xmlto/Makefile,v
retrieving revision 1.22
diff -u -p -r1.22 Makefile
--- textproc/xmlto/Makefile	23 Dec 2009 17:28:25 -0000	1.22
+++ textproc/xmlto/Makefile	27 May 2010 13:19:44 -0000
@@ -32,10 +32,10 @@ USE_BZIP2=	yes
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	BASH=${BASH_CMD} GETOPT=${GETOPT_CMD} PDFXMLTEX=${PDFXMLTEX_CMD}
 
-BASH_CMD=	${LOCALBASE}/bin/bash
-GETOPT_CMD=	${LOCALBASE}/bin/getopt
+BASH_CMD?=	${LOCALBASE}/bin/bash
+GETOPT_CMD?=	${LOCALBASE}/bin/getopt
 XSL_DIR=	${LOCALBASE}/share/xsl/docbook
-PDFXMLTEX_CMD=	${LOCALBASE}/bin/pdftex
+PDFXMLTEX_CMD?=	${LOCALBASE}/bin/pdftex
 
 MAN1=		xmlif.1 xmlto.1
 PORTDOCS=	AUTHORS COPYING ChangeLog NEWS THANKS
--- a.diff ends here ---
>Release-Note:
>Audit-Trail:
>Unformatted: