[Haskell-cafe] ANNOUNCE: vacuum-cairo: a cairo frontend to vacuum for live Haskell data visualization

[Sebastian Fischer]

On Mar 31, 2009, at 7:40 AM, Don Stewart wrote:

> I am pleased to announce the release of vacuum-cairo, a Haskell  
> library
> for interactive rendering and display of values on the GHC heap using
> Matt Morrow's vacuum library.

Awesome! I want to try this.

I have problems though installing it on an Intel MacBook running

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.10.1

$ cabal --version
cabal-install version 0.6.2
using version 1.6.0.2 of the Cabal library

$ ghc-pkg list gtk
/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.1/./ 
package.conf:
     gtk-0.10.0

I have installed gtk2hs using the instructions at

     http://www.haskell.org/haskellwiki/Gtk2Hs#Using_the_GTK.2B_OS_X_Framework

A simple cabal update; cabal install vacuum-cairo gives me:

$ cabal install vacuum-cairo
Resolving dependencies...
cabal: cannot configure vacuum-cairo-0.3.1. It requires svgcairo -any
There is no available version of svgcairo that satisfies -any

I have installed libsvg-cairo using MacPorts and it seems installed  
in /opt/local/lib:

$ ls /opt/local/lib/libsvg-cairo.*
/opt/local/lib/libsvg-cairo.1.0.1.dylib
/opt/local/lib/libsvg-cairo.1.dylib
/opt/local/lib/libsvg-cairo.a
/opt/local/lib/libsvg-cairo.dylib
/opt/local/lib/libsvg-cairo.la

But cabal-install still gives the same error. Even with --extra-lib- 
dirs set:

$ cabal install --extra-lib-dirs=/opt/local/lib/ vacuum-cairo
Resolving dependencies...
cabal: cannot configure vacuum-cairo-0.3.1. It requires svgcairo -any
There is no available version of svgcairo that satisfies -any

Hence, I downloaded the tarball and tried to use this instead to  
install vacuum-cairo, which lead to another problem: I cannot install  
the vacuum package because of a dependencies conflict due to the  
package ghc-6.10.1 requiring two different versions of process:

$ cabal install vacuum
Resolving dependencies...
cabal: dependencies conflict: ghc-6.10.1 requires process ==1.0.1.1  
however
process-1.0.1.1 was excluded because ghc-6.10.1 requires process  
==1.0.1.0

Funny.

Any ideas on how to get this cool package installed?

Thanks!
Sebastian