Hi,

I'm trying to install the Haskell cgi module, as per here http://passingcuriosity.com/2009/haskell-fastcgi-with-apache/. When I type cabal install cgi, I get the following error (on a Fedora instance):

cabal install cgi

Resolving dependencies...

Configuring MonadCatchIO-mtl-0.3.0.0...

Preprocessing library MonadCatchIO-mtl-0.3.0.0...

Building MonadCatchIO-mtl-0.3.0.0...

[1 of 1] Compiling Control.Monad.CatchIO ( Control/Monad/CatchIO.hs, dist/build/Control/Monad/CatchIO.o )

Control/Monad/CatchIO.hs:146:34:

    Illegal signature in pattern: E.SomeException

        Use -XPatternSignatures to permit it

cabal: Error: some packages failed to install:

MonadCatchIO-mtl-0.3.0.0 failed during the building phase. The exception was:

exit: ExitFailure 1

cgi-3001.1.8 depends on MonadCatchIO-mtl-0.3.0.0 which failed to install.

So, I modified my /root/.cabal/config with: