for python use an already installed version?

To: tech-pkg%netbsd.org@localhost
Subject: for python use an already installed version?
From: "Jeremy C. Reed" <reed%reedmedia.net@localhost>
Date: Thu, 3 Jan 2013 06:28:21 -0600 (CST)

See pkgsrc/lang/python/pyversion.mk. Why does the pkgsrc version do the 
following?
# if the default is accepted, it is first choice
 ... so skips ...
# prefer an already installed version, in order of "accepted"
I have python33 installed but it wants to build python27.
My package Makefile has:
PYTHON_FOR_BUILD_ONLY= yes
PYTHON_VERSIONS_INCLUDE_3X= yes
CONFIG_SHELL= ${PYTHONBIN}
.include "../../lang/python/application.mk"
Is there a pkgsrc way so I don't needlessly build a build dependency if 
I have a good enough one already installed (for makefile)?
My workaround is to set PYTHON_VERSION_DEFAULT=33 but that is not an 
infrastructure variable.

Follow-Ups:
- Re: for python use an already installed version?
  - From: Greg Troxel

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