New comment by arp242 on void-packages repository

https://github.com/void-linux/void-packages/issues/243#issuecomment-551385081

Comment:
> we should figure out how to provide several versions at once so people who want to upgrade can do so manually. It shouldn't be hard if all libraries are versioned properly so they don't conflict. My guess is that no one did it yet since relatively few people run postgres servers on Void so there's not much interest in it.

The easiest way to get this done is to create new `postgres10`, `postgres11`, and `postgres12` packages which all conflict with each other. That's what [FreeBSD does](https://github.com/freebsd/freebsd-ports/blob/master/databases/postgresql12-server/Makefile#L18-L22) for example.

While allowing multiple versions to be installed side-by-side would be better, multiple conflicting versions would already be a vast improvement over the current situation. 9.6 will still be supported until [Nov 2022](https://www.postgresql.org/support/versioning/), there are three new major releases (10, 11, and 12) that can't be easily used on Void right now, which is less than ideal.