[arch-haskell] bytestring-lexing

[Don Stewart]

magnus:
> There are two problems with getting bytestring-lexing compiled on
> Arch, since Don tends to read in here I'll report both here:
> 
> 1. The PKGBUILD lacks a dependency on 'alex', I'm guessing a
> 'makedepends' would suffice.

I think we need to add alex to the build-tools field. Otherwise
cabal2arch can't determine this.

> 2. Generating the documentation fails.
> 

I can work on that. 

Thanks for the report.