pkg_chk getting wrong version of Python package

[D'Arcy Cain <darcy%NetBSD.org@localhost>]

I am mostly using the latest Python (just converting to 3.6 now) but I 
still have a few modules that need to be built for 2.7.  Somehow pkg_chk 
is listing some of those as 3.6 and thus showing as missing.  This seems 
to be those packages that have only a 2.7 version built.  For example, 
let's say I have these packages installed:

py27-authres-0.800
py27-babel-2.3.4
py36-babel-2.3.4
py36-crypto-2.6.1nb2

According to pkg_chk I have the following installed:

py36-authres-0.800
py36-babel-2.3.4
py36-crypto-2.6.1nb2

This causes two problems for something like pkg_rolling-replace.  First 
py27-babel won't be rebuilt and second py36-authres is missing.

I tried looking through the script but I am not sure that there is a 
good fix for this.  As I see it two things need to be fixed, list the 
actual packages on the system and allow make to build arbitrary versions 
instead of looking at mk.conf.  I tried to do the latter with "make 
-DPYTHON_VERSION_DEFAULT=27 install" but it still tried to build 3.6 as 
defined in mk.conf.

Anyone else struggled with this and have some suggestions?

--
D'Arcy J.M. Cain <darcy%NetBSD.org@localhost>
http://www.NetBSD.org/ IM:darcy%Vex.Net@localhost