On 08-Aug-98 Curt Sampson spoke unto us all:
#  This, of course, means that those of us compiling it end up having
#  two full copies of the source tree around, and there are two separate
#  things to update when a new version comes out.
#  
#  Is there some better way to go at this?

Yep:

WRKSRC=         ../xview-config/work/xview-3.2p1.4
ALL_TARGET=     clean all

(stolen from a xview pkg i've been fiddling with on and off)

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Tim Rightnour    -  root@garbled.net
http://www.zynetwc.com/~garbled/garbled.html