Hi, It was suggested on #ghc we get a discussion going about #7143. We think it's a good idea that `we should have a default value for lllc and opt anyways ... even in[if] the host building system doesn't have it locally`. Non-windows platforms seem to have one that's configured in aclocal.m4. I tried pulling this conditional thing out and getting it running on Windows too, but for some reason it doesn't work even if I explicitly set the values to "llc" and "opt". Regards, Kyle