And as usual I got interrupted and clicked send before finishing a thought… (sorry about that but it helps demonstrate our time constraints)

 

But following up my earlier comments

 

 

Now that being said you can review the freeswitch.spec file in the root of the source tree or the Debian packaging files in the debian dir also in the source tree to get a list of build deps and if min versions are required what those are.

 

Things without version numbering in those files are that way due to the current versions in the appropriate Distros being sufficient and Distros typically do not change APIs once theyhave released a  version (or on minor versions upgrades)_