tl;dr: We are giving this release yet another attempt. Cross your fingers and try building again. So after many attempts I was able to reproduce the issue seen by Andrés and Karel and believe I have merged a fix. The issue is documented as Trac #12078. Thanks to everyone who helped pin down the issue. I've uploaded a new set of source tarballs to the usual location, http://downloads.haskell.org/~ghc/8.0.1/ These tarballs are derived from, 4986837f8168cacf95c24fecc84d7b36c47f3c11 For reference, the SHA1 sum of the new source tarballs is, 585a2d34a17ce2452273147f2e3cef1a2efe1aa5 ./ghc-8.0.1-src.tar.xz Let me know how your builds go. I don't anticipate any further issues, but one rarely does. Finally: thank you all so much for your patience while we worked through these issues. I hope it's a long time until we see such a drawn out and problematic release. Cheers, - Ben