nixpkgs/pkgs/development/compilers/ghcjs/ghcjs-boot.nix

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{ runCommand, src }:
# we remove the patches so ghcjs-boot doesn't try to apply them again.
runCommand "${src.name}-patched" {} ''
cp -r ${src} $out
chmod -R +w $out
# Make the patches be relative their corresponding package's directory.
# See: https://github.com/ghcjs/ghcjs-boot/pull/12
for patch in $out/patches/*.patch; do
echo ">> fixing patch: $patch"
sed -i -e 's@ \(a\|b\)/boot/[^/]\+@ \1@g' $patch
done
for package in $(cd $out/boot; echo *); do
patch=$out/patches/$package.patch
if [[ -e $patch ]]; then
echo ">> patching package: $package"
pushd $out/boot/$package
patch -p1 < $patch
rm $patch
popd
fi
done
''