Custom build of the open source project

Hello

 I'm using some open-source projects code in my work. I need make
changes with open-souce code to implement some feature. This changes
is too specific and cann't be used in the project sometime.
 Is there "the best practice of" maintaince custom changes with new versions?

 E.g. os1 - project with my changes based on 1.1 version hosted in the
local repository. How should I merge local changes with new 1.2
version? Should I put local changed source code into the separate
project with original code?
repository
-os1 //changed sources
--trunk
-os2 // original souces
--trunk

Thank you

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Received on Tue Apr 5 17:00:27 2005