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- The LLVM backend always needs an LLVM specific assembler, i.e. clang that ideally matches the version of LLVM actually used for codegen. - The LLVM backend on Darwin requires some version of clang to be available. In light of LLVMAS, using a matching version seems to be best though this does risk messing with clang used for compiling C in the derivation. This mess can be avoided by compiling GHC with useLLVM = true which sets absolute paths in GHC's settings file. Due to closure size constraints, we can't really do that if NCG is available.