I would like to install xmonad 0.9.2 (which worked fine for me) on my Ubuntu 12.04 system (GHC 7.4.1).
If you're having problems with 0.10, perhaps we should be examining the diffs between the two to see what changed and why. (Although "why" isn't always explained; not all programmers comment or document as well as they should.)
XMonad/Layout/MouseResizableTile.hs:182:17:
Could not deduce (Eq t) arising from the literal `0'
from the context (Num t)
bound by the type signature for
replaceAtPos :: Num t => [Rational] -> t -> Rational -> [Rational]
at XMonad/Layout/MouseResizableTile.hs:(182,1)-(185,61)
Possible fix:
add (Eq t) to the context of
It's telling you exactly how to fix it.
Num used to imply Eq and Show, but no longer does; as such, those constraints may need to be added in some places where pre-7.2 compiled things without error. In this case we don't need Show but do need Eq.
cabal unpack xmonad-contrib-0.9.2
vi -n +182 XMonad/Layout/MouseResizableTile.c
# or use your favorite editor to change "Num t =>" to "(Num t, Eq t) =>"
cabal install # no package name here; it will build and install the package in the current directory