pkg/50542: lang/python27 fails to install with USE_BUILTIN.openssh=yes

[slitvinov%gmail.com@localhost]

>Number:         50542
>Category:       pkg
>Synopsis:       lang/python27 fails to install with USE_BUILTIN.openssh=yes
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Dec 12 17:25:00 +0000 2015
>Originator:     Sergey Litvinov
>Release:        Scientific Linux release 6.0 (Carbon)
>Organization:
ETH
>Environment:
Linux vagrant-sl6-64 2.6.32-71.24.1.el6.x86_64 #1 SMP Fri Apr 8 01:07:23 CDT 2011 x86_64 x86_64 x86_64 GNU/Linux
>Description:
lang/python27 fails to install on Scientific Linux if I set USE_BUILTIN.openssh=yes in mk.conf

The error message is
pkg_create: can't stat `/home/vagrant/maxima-deploy/pkgsrc/lang/python27/work/.destdir/home/vagrant/maxima-deploy/prefix/lib/python2.7/lib-dynload/_hashlib.so'
pkg_create: can't stat `/home/vagrant/maxima-deploy/pkgsrc/lang/python27/work/.destdir/home/vagrant/maxima-deploy/prefix/lib/python2.7/lib-dynload/_ssl.so'

In the logs I see

Python build finished, but the necessary bits to build these modules were not found:
_sqlite3           _ssl               _tkinter        
dl                 gdbm               imageop         
sunaudiodev                                           

I can install lang/python27 if I add openssl-devel package to the base system

sudo yum install openssl-devel
>How-To-Repeat:
bmake install in lang/python27 on Scientific Linux  with Scientific Linux and USE_BUILTIN.openssh=yes
>Fix: