[Haskell-cafe] Cabal and DB packages
emmanuel.delaborde at citycampus.com
Sun Nov 25 12:49:57 EST 2007
I'm trying to do something that should be fairly simple, installing
some DB package so I can use MySQL or SQLite.
However I've had troubles building HSQL, HaskellDB and Takusen before
giving up (I am using ghc 6.8.1 and Cabal-18.104.22.168).
with HSQL :
Could not find module `System.Time':
it is a member of package old-time-22.214.171.124, which is hidden
so I added 'old-time' to the 'build-depends' line in the .cabal file
but then it fails building with
[1 of 2] Compiling Database.HSQL.Types ( Database/HSQL/Types.hs, dist/
Database/HSQL/Types.hs:134:18: Not in scope: type variable `forall'
Database/HSQL/Types.hs:134:25: Not in scope: type variable `a'
Illegal operator `.' in type `forall a . (Int
-> (FieldDef ->
CString -> Int -> IO a) -> IO a)'
(Use -XTypeOperators to allow operators in types)
At this point, it goes over my head...
What the hell, I'll use HaskellDB and FlatDB, but then I get this
message while building HaskellDB :
Illegal signature in pattern: l f a
Use -XPatternSignatures to permit it
when I add 'PatternSignatures' to the 'Extensions:' line in .cabal,
it fails configuring with :
Setup.hs: haskelldb.cabal:8: Parse of field 'extensions' failed:
Jeeeesus, nevermind, I'll try Takusen
with Takusen :
$ runhaskell Setup.hs configure
Could not find module `Distribution.Program':
Use -v to see a list of the files searched for.
I give up...
Is there any simple way to do it though ? Is there any problems with
Cabal that I need to work around ?
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