[Haskell-cafe] Specify OS version

[Sergey Bushnyak]

Hi Cafe!

I have program written in Haskell and Swift that runs on Mac. This 
program uses some features that was introduced in last version of OS X 
“Yosemite” 10.10, but some of my users use previous version "Maverics " 
10.9. Is there some technique that allows me to extend my cabal file and 
specify which *version* of os is currently in use and don't load some of 
modules?

AFAIK, Cabal's `conditional` doesn't provide such mechanism, but 
something like

```
if os(osx) && ver(=10.10)
if os(osx) && ver(<=10.9)

```
will be nice.


Maybe there is other approach to this problem?I don't want to use `CPP` 
extension to handle this within code.

Thanks

--
Best regards,
Sergey Bushnyak
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