Hey all,

What are the oldest ghc versions folks are actually using to build software they actually use ? What are the contexts for these ?

I know a lot of library maintainers, myself included try to make it easy to suport as wide a version range of ghc as possible.  In my case I find it useful to just have another way to evaluate how stable I can make a library. 

That said, what actual old ghc versions are folks actually using? 

Afaict, the oldest ghc currently in a lts linux distro is ghc 7.0 in centos 6

Then centos 7 and the oldest Ubuntu lts are 7.6, then more recent distros plus most other os platforms like the bsds are on 8.0-8.4 as the oldest supported / provided ghc.  

Who are the users today and how important are they for todays library maintainers ?