If I do: $ cd test && make TESTDIRS=CodeGen VERBOSE=1 I get: /Volumes/mrs5/net/llvm/llvm-build/tools/clang/test/CodeGen/Output/ 2009-04-23-dbg.c.script: line 1: llc: command not found if I do: $ make test it works. :-( I suspect someone it setting PATH up in the first case, but is, in the second case. I don't have an llc in my path.