getting cabal/ghc working on heroku

gistfile1.sh

#!/bin/sh

# Run this on an empty Heroku app:
# heroku create -s cedar my-haskell
# heroku run bash --app my-haskell

curl ftp://ftp.gmplib.org/pub/gmp-5.0.2/gmp-5.0.2.tar.bz2 | tar -xjvf -
cd gmp-5.0.2
./configure -prefix /app/gmp
make install
(seems to work, make check all passes)
export LD_LIBRARY_PATH=/app/gmp/lib

curl "http://www.haskell.org/ghc/dist/7.0.4/ghc-7.0.4-x86_64-unknown-linux.tar.bz2" | tar -xjvf -
cd ghc-7.0.4
./configure -prefix /app/ghc
make install


NEED TO CONFIGURE RTS AS PER
http://stackoverflow.com/questions/2558166/using-ghc-cabal-with-gmp-installed-in-user-space
/app/ghc/bin/ghc-pkg describe rts | sed

ghc/bin/ghc-pkg describe rts | sed "s/library-dirs: \/app\/ghc\/lib\/ghc-7.0.4/library-dirs: \/app\/ghc\/lib\/ghc-7.0.4\n               \/app\/gmp\/lib\//" > rts.pkg

curl http://lambda.haskell.org/platform/download/2011.4.0.0/haskell-platform-2011.4.0.0.tar.gz | tar -xzvf -
cd haskell-platform-2011.4.0.0
./configure -prefix /app/haskell-platform --with-ghc=/app/ghc/bin/ghc --with-ghc-pkg=/app/ghc/bin/ghc-pkg --with-hsc2hs=/app/ghc/bin/hsc2hs


curl http://www.haskell.org/cabal/release/cabal-1.10.2.0/Cabal-1.10.2.0.tar.gz | tar -xzvf -
cd Cabal-1.10.2.0

/app/ghc/bin/runghc Setup.hs configure --user --prefix=/app/caballib -p --with-compiler=/app/ghc/bin/ghc --ghc
/app/ghc/bin/runghc Setup.hs build
/app/ghc/bin/runghc Setup.hs install

curl "http://www.haskell.org/cabal/release/cabal-install-0.10.2/cabal-install-0.10.2.tar.gz" | tar -xzvf -
cd cabal-install-0.10.2
export PATH="$PATH:/app/ghc/bin"
sh bootstrap.sh

/app/ghc/bin/runghc Setup.hs configure --user --prefix=/app/cabal-install -p --with-compiler=/app/ghc/bin/ghc --ghc
/app/ghc/bin/runghc Setup.hs build
/app/ghc/bin/runghc Setup.hs install

congrats, you now have a working cabal in /app/.cabal/bin.