Hi, Sometimes it is the best to answer your own questions. I downgraded tot 3.2.5 and applied the changes necessary to install on jailbroken phones. HaskellDraw gives however the same problems (more than 1800 errors). I read that it is an old version that should be changed. GetInBehind compiles correctly now for a device. After removing the codesign rule form the project file, I could install it in my phone. Looking through the code shows me I have a lot to learn, but as a Haskell app can be installed now, doing this can be checked against running code. Let's see how to make Hello World in Haskell first. regards, Ton