I tried installing vacuum-cairo on OS X 10.6 but it failed. With the help of HomeBrew I installed the dependencies by doing the following:

Be sure to run brew update first.

Then install the dependencies:

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brew install pkg-config
brew install glib
brew install librsvg
chmod u+w /usr/local/Cellar/gdk-pixbuf/2.23.5/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache
brew install librsvg
brew install pango

Note the installing of librsvg twice, this is in accordance with https://github.com/mxcl/homebrew/issues/4970. If you don’t get an error after running the first install of librsvg you might have a new update brew of librsvg.

And finally install vacuum-cairo:

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cabal install vacuum-cairo