Cabal, System.Filepath

Peter Gammie peteg42 at
Thu Dec 6 09:44:55 EST 2007

On 06/12/2007, at 6:56 PM, Duncan Coutts wrote:

> On Thu, 2007-12-06 at 17:35 +0700, Peter Gammie wrote:
>> Can I humbly suggest that Cabal rely on very few external libraries?
> We recently defined filepath to be a core library. As you point out
> however this does pose a problem for older compilers. Fortunately it's
> not that bad, you can build and install filepath using the older cabal
> that comes with your older compiler. If that's not possible for  
> whatever
> reason you can download both Cabal and filepath and:
> ghc -i../filepath --make Setup.lhs -o setup

I realise all this, I just wanted to log the fact that darcs-Cabal  
does not build on GHC 6.6. I thought it was a design goal for Cabal to  
compile on all GHCs back to 6.4.x (or something). No matter, I  
installed GHC 6.6.1:

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.6.1

Next problem: let's reinstall the 'cgi' package (latest from darcs):

$ ghc-pkg list
     Cabal-, Cabal-1.3.1, base-2.1.1, filepath-1.0, (ghc-6.6.1),
     haskell98-1.0, parsec-2.0, readline-1.0, regex-base-0.72,
     regex-compat-0.71, regex-posix-0.71, rts-1.0, stm-2.0,
     template-haskell-2.1, unix-2.1
     mtl-, network-, xhtml-3000.0.2.1

Note that I've installed the dependencies in my home directory.

$ runghc Setup.*hs configure --prefix=$HOME -v3
Configuring cgi-3001.1.5.1...
Creating dist (and its parents)
/usr/bin/ghc --numeric-version
looking for package tool: ghc-pkg near compiler in /usr/bin
found package tool in /usr/bin/ghc-pkg
/usr/bin/ghc-pkg --version
/usr/bin/ghc -c /tmp/tmp19799.c -o /tmp/tmp19799.o
/usr/bin/ld -x -r /tmp/tmp19799.o -o /tmp/tmp19800.o
Reading installed packages...
/usr/bin/ghc-pkg --global list
Setup.hs: At least the following dependencies are missing:
     network >=2.0, mtl >=1.0, xhtml >=3000.0.0

Why is ghc-pkg looking only at globally-installed packages?


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