Multiple Python versions

[cpghost]

On Wed, Jan 07, 2009 at 02:02:40PM +0100, Gerhard Schmidt wrote:
> Hi,
> 
> I've two python versions running on my workstation. Python2.4 for Zope and
> Python2.5 because even some X11 components need python2.5 these days.
> 
> when i try to install some python packages in bot versions via ports i get
> this error message.
> 
> ===>  Installing for py25-dbus-0.83.0_1
> ===>   py25-dbus-0.83.0_1 depends on file: /usr/local/bin/python2.5 - found
> ===>   Generating temporary packing list
> ===>  Checking if devel/py-dbus already installed
> ===>   An older version of devel/py-dbus is already installed
> (py24-dbus-0.83.0_1)
>       You may wish to ``make deinstall'' and install this port again
>       by ``make reinstall'' to upgrade it properly.
>       If you really wish to overwrite the old port of devel/py-dbus
>       without deleting it first, set the variable "FORCE_PKG_REGISTER"
>       in your environment or the "make install" command line.
> 
> Wasn't the version prefix to allow a port being installed in two different
> Python Version.
> 
> Any way to get this working without having to force the installation every
> time.

You can try this in /etc/make.conf:

# Global setting
PYTHON_DEFAULT_VERISON=python2.5

# some/py-port requires python2.4 (install py24-... port)
.if ${.CURDIR:M*/some/py-port}
PYTHON_DEFAULT_VERSION=python2.4
.endif

It's not perfect, because some pyNN-... ports still share some
files, esp. scripts in /usr/local/bin, etc., but it works for many
Python ports already. ;)

> Regards
> 	Estartu

-cpghost.

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