Hi All. I've installed on my MacOS X 10.6.7 (Xcode4) the new GHC 7.0.3 (64 bit) All works fine, but every time I build my code I get the warning: ld: warning: could not create compact unwind for _ffi_call_unix64: does not use RBP or RSP based frame Is this warning something bad? Thanks. Luca.