Hi, I've just tried building GHC HEAD using GHC 6.8.3 on Windows following the instructions on the wiki (http://hackage.haskell.org/trac/ghc/wiki/Building/Windows) I initially got a failure about cc1 not being found when executing 6.8.3's gcc, which I worked around by adding c:/ghc/ghc-6.8.3/gcc-lib at the end of the path (i.e. last priority) After this error I get a problem with include files, see the attached log file. It looks like include files are going wrong between Mingw and 6.8.3. My current $PATH variable is: /cygdrive/c/mingw/bin:/usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin:/cygdr ive/c/WI NNT/Microsoft.NET/Framework/v2.0.50727:/cygdrive/c/local/MikTex/texmf/mi ktex/bin :/cygdrive/c/Perl/site/bin:/cygdrive/c/Utils/mks/MKSNT:/cygdrive/c/WINNT /system3 2:/cygdrive/c/WINNT:/cygdrive/c/WINNT/System32/Wbem:/cygdrive/c/CSsystem :/cygdri ve/c/Utils:/cygdrive/c/Program Files/Sybase.12/OCS-12_0/bin:/cygdrive/c/ghc/ghc- 6.8.3:/cygdrive/c/ghc/ghc-6.8.3/bin:/cygdrive/c/bin:/cygdrive/c/Program Files/Ha skell/bin:/cygdrive/f/ImslNT.30/CNL/Bin:/cygdrive/c/Utils/mks/mksnt:/cyg drive/f/ Fame/76:/cygdrive/c/Utils/mks/MKSNT:/cygdrive/c/ghc/ghc-6.8.3/gcc-lib Thanks Neil ============================================================================== Please access the attached hyperlink for an important electronic communications disclaimer: http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html ==============================================================================