ports/153132: Autotools cleanup: upgrade churn reduction

[Ade Lovett]

>Number:         153132
>Category:       ports
>Synopsis:       Autotools cleanup: upgrade churn reduction
>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:   Mon Dec 13 20:50:09 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Ade Lovett
>Release:        N/A
>Organization:
>Environment:
	N/A

>Description:
	Introduce a new target to allow patching of autotools-related
	code via a two-step process.

	For example: a patch might change a reference to 'autoconf-2.61'
	to %%AUTOCONF%%, this target will the auto-substitute the correct
	value - ${AUTOCONF} in this case.

	This dramtically cuts down on the amount of tree churn required
	in the event of an autoconf/automake/libtool update.

>How-To-Repeat:
>Fix:
	http://tinderbox.lovett.com/patches/autotools-dechurn-20101213.diff

	SHA256 =
	  9b04c660c2b563c7776b06bcfb75ab8a19dcab5c3f4c01af2c487716521e60bb
>Release-Note:
>Audit-Trail:
>Unformatted: