The short answer is, yes, you can do that. The longer answer is that this is 
usually not a good idea for something like gregorio. Unlike, say iTunes, that 
Apple posts binary updates for from time to time, Gregorio is an open source 
project that has periodic updates to its source code. The usual method to track 
source code changes is to use CVS or SVN. Gregorio uses SVN. So one checks out 
the source via SVN using:

        svn co svn://svn.gna.org/svn/gregorio/trunk

from the command line (Terminal.app). This checks out the initial source code 
and dumps it into a directory (folder) called trunk. To see if the source is 
updated, one would cd into trunk and do a:

        svn up

That will update the source with any changes. If there are changes, then one 
can recompile & reinstall. svn up will also tell you the current source 
version. Since gregorio is very small, 26MB, it is best to leave it on your 
drive.

Since you deleted the source, there is no way to get the SVN version number you 
used. About all you can do is type 'gregorio -V' to see the version of the 
gregorio tool. (FYI: it is gregorio version 2.1-svn) Since gregorio is more 
than just this binary, it will not tell you all the details of what you 
installed. 

So, sad to say, check out gregorio again with SVN and compile & install. Then 
we can go from there. You'll want to keep the source in case we need to tweak 
it for your setup and for any future updates, so don't delete it. Oh! Also, SVN 
updates are more regular than the downloads page, so the latest and greatest is 
always in SVN and not via the downloads page. Stick it in your Documents folder 
if you don't want it cluttering up your Desktop or home directory.


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                          Michael Martin
                     [email protected]
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