Hi, I cannot build GHC head today on Linux. It seems to me that this bug is relating to the followings: https://github.com/sol/doctest-haskell/issues/59 https://github.com/sol/doctest-haskell/pull/60 Why did the initial value of v_opt_C_ready in GHCI change? --Kazu Haddock coverage: 100% ( 1 / 1) in 'GHC.IntWord64' 78% ( 7 / 9) in 'GHC.Types' 3% ( 2 / 63) in 'GHC.Tuple' 0% ( 0 / 3) in 'GHC.Debug' 0% ( 0 /351) in 'GHC.PrimopWrappers' 2% ( 1 / 43) in 'GHC.PrimWrappers' 17% ( 1 / 6) in 'GHC.CString' 31% (170 /540) in 'GHC.Prim' 100% ( 3 / 3) in 'GHC.Magic' 38% ( 6 / 16) in 'GHC.Classes' haddock: internal error: haddock: panic! (the 'impossible' happened) (GHC version 7.7.20130912 for x86_64-unknown-linux): Static flags have not been initialised! Please call GHC.newSession or GHC.parseStaticFlags early enough. Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug make[1]: *** [libraries/ghc-prim/dist-install/doc/html/ghc-prim/ghc-prim.haddock] Error 1