[plt-scheme] PLT versions

From: Nicholas Chubrich (chubrich at cs.brandeis.edu)
Date: Fri Jan 6 01:27:40 EST 2006

	Thanks for your reply, I'll give that a try (once I back up my
system for in case it messes things up; I'm still trying to figure out an
efficient way to do that with Retrospect and DVDs---I might just get a
backup hard drive).  Another way I was thinking of doing this was just
installing it in a different directory, along the lines of the way
DarwinPorts installs packages in the /opt/local/bin directory in a way
that is not supposed to interfere with other software.  In theory you 
should be able to install software in any directory, from what I can
	I'll let you know how both methods turn out when I get to it, 
probably next week.  It'll take all of a half hour, but the ability to 
"turn back the clock" on my system to undo software installation manglings 
(which in my experience are the cause of lots of problems) is too darned 

Nick Chubrich.

On Mon, 2 Jan 2006, Matt Jadud wrote:

> 1. Installing multiple versions on OSX
> I found at various times that the PLT installer refused to let me 
> install multiple versions. A solution that seems to work is to reach into
> /Library/Receipts
> and remove all of the receipts pertaining to PLT Scheme; I believe these 
> will be the receipts for the MzScheme and MrEd frameworks, in 
> particular. Given that the PLT installer actually takes care not to 
> overwrite any previous versions, these artifacts of the OSX installation 
> process are not (I don't believe) critical to the operation of 
> Mz/DrScheme on your machine.
> I currently have 209, several versions of 299.X, and 300 installed from 
> the binary installers; the conflicts are generally minimal, although the 
> Help Desk was occasionally wonky in the middle of those versions---for 
> reasons I never really cared to understand or explore.
> 2. The transition from v209 to v300 was significant; there have been 
> changes throughout the language. MrEdDesigner most likely suffers from 
> differences in the class system and how strings are handled; that's an 
> off-the-cuff guess based on having looked at the code many moons ago.
> Hope that helps a bit.
> M
> Nicholas Chubrich wrote:
> > I'm just starting out with PLT (after having used MIT before).  In trying 
> > to work with a package (MrEdDesigner) I find that it works with v209 but 
> > not v299.  Is this generally true of packages and modules (found on PLaneT 
> > for instance) that they will not work with later versions of PLT?  Can 
> > they be made to work?  If not, what is the best way of installing multiple 
> > versions of PLT (on Mac OX) so that they do not conflict?
> > 
> > Thanks,
> > 
> > Nick Chubrich.
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