Re: [xmonad] GroupNavigation build error

Ivan Lazar Miljenovic [2010.05.11 2137 +1000]:

Toby Cubitt writes:

...

Hi,

I'm getting build errors in the new GroupNavigation module when compiling xmonad-contrib. This is with the latest xmonad and xmonad-contrib darcs checkout (via the darcs ebuilds on Gentoo), with GHC 6.10.4. (If I've missed any other relevant information, please let me know.)

Is this a problem with my GHC version, or my installation of some haskell library, or is it a bug in GroupNavigation?

Oh-oh.... looks like filter was only added to Data.Sequence as part of containers-0.3, which comes with GHC 6.12.

Oops. I just submitted a patch adding this module to xmonad-contrib. I'm running arch linux, which comes with GHC 6.12 and never bothered to check whether there are any problems with older GHC versions. Sorry. One way to "fix" this would be to expect everyone running darcs xmonad to use the latest version of containers, but I'm not sure that's reasonable. Another alternative I see is to use CPP to include home-brewed versions of filter and breakl directly in GroupNavigation if the detected GHC version is < 6.12. Any suggestions from the people with authority (Don, Spencer, Adam, ...) as to what the preferred solution is? - Norbert