id	summary	reporter	owner	description	type	status	priority	milestone	version	resolution	keywords	cc
55	haskeline cannot be built with ghc-6.6.1	judah		"Haskeline currently can't be built using ghc-6.6.1.  

At least one cause of the problem is that utf8-string can't be built with that compiler:
{{{
judah-jacobsons-computer:~ judah$ cabal install utf8-string --with-compiler=ghc-6.6.1
Resolving dependencies...
'utf8-string-0.3.3' is cached.
Configuring utf8-string-0.3.3...
Preprocessing library utf8-string-0.3.3...
Building utf8-string-0.3.3...
[1 of 6] Compiling Codec.Binary.UTF8.String ( Codec/Binary/UTF8/String.hs, dist/build/Codec/Binary/UTF8/String.o )
[2 of 6] Compiling Codec.Binary.UTF8.Generic ( Codec/Binary/UTF8/Generic.hs, dist/build/Codec/Binary/UTF8/Generic.o )

Codec/Binary/UTF8/Generic.hs:48:18: Not in scope: `B.uncons'

Codec/Binary/UTF8/Generic.hs:58:18: Not in scope: `L.uncons'
cabal: Error: some packages failed to install:
utf8-string-0.3.3 failed during the building phase. The exception was:
exit: ExitFailure 1
}}}"	task	closed	minor			fixed