[Haskell-cafe] Cabal Compiler Flag Problem
ben.derrett at googlemail.com
Wed Mar 24 01:26:02 EDT 2010
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
Preprocessing library MonadCatchIO-mtl-0.3.0.0...
[1 of 1] Compiling Control.Monad.CatchIO ( Control/Monad/CatchIO.hs,
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
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:
-- flags: -XPatternSignatures
This doesn't seem to resolve the problem. What do I need to do to change the
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