I am trying to use llvm but am being told I don't have llvm installed. Dominics-MacBook-Pro:Laplace dom$ ghc src-repa/Main.hs -rtsopts -threaded -eventlog -Odph -fllvm -optlo-O3 -fno-liberate-case -isrc-repa [1 of 3] Compiling SolverStencil ( src-repa/SolverStencil.hs, src-repa/SolverStencil.o ) Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package pretty-1.1.1.0 ... linking ... done. Loading package array-0.4.0.1 ... linking ... done. Loading package deepseq-1.3.0.1 ... linking ... done. Loading package containers-0.5.0.0 ... linking ... done. Loading package old-locale-1.0.0.5 ... linking ... done. Loading package time-1.4.0.1 ... linking ... done. Loading package random-1.0.1.1 ... linking ... done. Loading package template-haskell ... linking ... done. Loading package QuickCheck-2.5.1.1 ... linking ... done. Loading package bytestring-0.10.0.2 ... linking ... done. Loading package primitive-0.5.0.1 ... linking ... done. Loading package vector-0.10.0.1 ... linking ... done. Loading package repa-3.2.3.1 ... linking ... done. <no location info>: Warning: Couldn't figure out LLVM version! Make sure you have installed LLVM ghc: could not execute: opt The ghc documentation (http://www.haskell.org/ghc/docs/7.6.1/html/users_guide/code-generators.html) says that llvm and clang are installed by default for 10.6 and later. I am on 10.8.3. Indeed Dominics-MacBook-Pro:Laplace dom$ llvm- llvm-cpp-4.2 llvm-g++ llvm-g++-4.2 llvm-gcc llvm-gcc-4.2 And Dominics-MacBook-Pro:Laplace dom$ clang clang clang++ But ghc-info tells me Dominics-MacBook-Pro:Laplace dom$ ghc --info [("Project name","The Glorious Glasgow Haskell Compilation System") ,("GCC extra via C opts"," -fwrapv") ,("C compiler command","/usr/bin/gcc") ,("C compiler flags"," -m64 -fno-stack-protector -m64") ,("ar command","/usr/bin/ar") ,("ar flags","clqs") ,("ar supports at file","@ArSupportsAtFile@") ,("touch command","touch") ,("dllwrap command","/bin/false") ,("windres command","/bin/false") ,("perl command","/usr/bin/perl") ,("target os","OSDarwin") ,("target arch","ArchX86_64") ,("target word size","8") ,("target has GNU nonexec stack","False") ,("target has .ident directive","True") ,("target has subsections via symbols","True") ,("LLVM llc command","llc") ,("LLVM opt command","opt") ,("Project version","7.6.2") ,("Booter version","7.4.2") ,("Stage","2") ,("Build platform","x86_64-apple-darwin") ,("Host platform","x86_64-apple-darwin") ,("Target platform","x86_64-apple-darwin") ,("Have interpreter","YES") ,("Object splitting supported","YES") ,("Have native code generator","YES") ,("Support SMP","YES") ,("Unregisterised","NO") ,("Tables next to code","YES") ,("RTS ways","l debug thr thr_debug thr_l thr_p dyn debug_dyn thr_dyn thr_debug_dyn") ,("Leading underscore","YES") ,("Debug on","False") ,("LibDir","/usr/local/lib/ghc-7.6.2") ,("Global Package DB","/usr/local/lib/ghc-7.6.2/package.conf.d") ,("Gcc Linker flags","[\"-m64\"]") ,("Ld Linker flags","[\"-arch\",\"x86_64\"]") ] But I don't have either llc or opt Dominics-MacBook-Pro:Laplace dom$ llc -bash: llc: command not found Dominics-MacBook-Pro:Laplace dom$ opt -bash: opt: command not found Dominics-MacBook-Pro:Laplace dom$ What is the solution? Thanks, Dominic Steinitz dominic@steinitz.org http://idontgetoutmuch.wordpress.com