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this is a quick guide to diagnosing what could be wrong.This:"""/var/folders/Dz/Dz5WpFSZGUaFLA8jp8kT5E+++TM/-Tmp-/working_source.hs:7:7: Could not find module `Foreign': Perhaps you haven't installed the "dyn" libraries for package `base'?"""indicates that GHC HEAD was not installed correctly. Run somethinglike "find /usr/local -iname '*dyn_hi'" to check that the GHC you areusing has all its dynamic library header files installed. If itdoesn't, you probably didn't build GHC the right way: checkhttp://www.shimweasel.com/2009/09/16/another-awful-hack-to-ghc-6-11andhttp://www.shimweasel.com/2009/09/14/unprincipled-skulduggery-with-ghc-6-12-dylibs-on-mac-os-xfor more info.