wxFruit is a Haskell GUI library based on Functional Reactive Programming concepts. It uses wxWindows as its underlying GUI framework. For FRP it uses the Haskell FRP framework Yampa.

Both libraries are relatively old and seem to have suffered bitrot as I couldn't get them to compile using a recent GHC build (GHC 6.4.x). A bit of searching came across this post to the haskell-jp list which had some patches (afrp.diff and wxfruit.diff) to enable these to build. The patches and pre-patched tarballs I hosted here are no longer available.

These can be applied by using 'patch' from within the original wxFruit and Yampa distributions:

cd afrp-0.4
patch -p1 <afrp.diff
cd ../wxfruit-0.1
patch -p1 <wxfruit.diff

To build and install the patched Yampa, the following should work:

cd afrp-0.4
runhaskell Setup.hs configure
runhaskell Setup.hs build
sudo runhaskell Setup.hs install

Once this is done the wxFruit paddle example builds with:

cd ../wxfruit-0.1
ghc --make -farrows -o paddle paddle.hs