Hello! I want to use the native UI of iOS for my apps(*) and came across Alien and FFI. I did a ConfigurationOfAlien loadMacOSX to see the samples and each of this samples reveals a MessageNotUnderstood exception for Alien>>lookup if they are called. No errors on loading the packages into the image. ObjCRuntimeRef>alienMethodNamed: is calling Alien>>lookup: This method was moved from Alien to AlienLibrary with Alien-Core-sd.17. A closer look into the source (in Alien or AlienLibrary) shows that the given libraryname is completly ignored and only IAB32 is used. The first use of Alien>>lookup is found in ObjCRuntimeRef>initialize. Completely lost at the moment, because I'm sure the samples have worked (someday), but the changes in Alien (moved lookup and so on) are from 2009. Can you give me some hints what I did wrong, or what I should do to give better information to you? Is Alien/FFI the right path or should I use an other package (which one)? What I did: OS X 10.8.2 with the CogVM app for Pharo 1.4 and the summer from the pharo-project site. Gofer it squeaksource: 'MetacelloRepository' ; package: 'ConfigurationOfFFI' ; load. (ConfigurationOfFFI project version: '1.5') load. Gofer it squeaksource: 'MetacelloRepository' ; package: 'ConfigurationOfAlien' ; load. ConfigurationOfAlien loadMacOSX. I tried also 'ConfigurationOfOldAlien' because this version has the Alien>>lookup, but then I have no ObjCRuntimeRef/Samples. Many thanks in advance! Gerold (*) I have managed to compile an iOS VM under OS X 10.8.2 with XCode 4.5.1 with iOS SDK 6.0. Pharo 1.4 StackVM is running with the cleanForProduction Summer image on iPhone 4s and iPad2. Many thanks to Esteban Lorenzano (and all the others!) for his https://gitorious.org/cogvm/blessed -- Gerold Pummer Salzburg, Austria