This is ad-hoc programming, what you are needing is an architecture with release management. You can develop something but as some moment it should get hands over to production.
For EG and DI you are sharing the appserver (<SASApp>) that is the place where shared changes should be made.
- Ask you platform admin to modify the sas usermods files accordingly supporting those library with formats
- remove all own build code you done as post and/or pre process for that.
- For develop the library should be defined open for update for common usage it should be set as read-only
---->-- ja karman --<-----