[Freeswitch-users] Updating FS to a particular version

Hello, What would be the right way to update existing system to a particular version? Under normal conditions I'd do "make current" Here I want exactly the same, but: -specify the version to install Making sure to: -preserve non-standard ./configure string used during initial install -make sure conf directory is not overwritten by stock config. -make sure modules.conf is not overwritten / changed It should be simple...but want to avoid trial and error. WiKi is somewhat confusing. Thank you, -Victor