I'm trying to build GHC on 64-bit Windows 7. I installed Cygwin, GHC and cloned the main repo but when I run configure I get this error: configure: Building in-tree ghc-pwd checking for path to top of build tree... cygwin warning: MS-DOS style path detected: C:/cygwin64/home/tewi/head Preferred POSIX equivalent is: /home/tewi/head CYGWIN environment variable option "nodosfilewarning" turns off this warning. Consult the user's guide for more details about POSIX paths: http://cygwin.com/cygwin-ug-net/using.html#using-pathnames C:/cygwin64/home/tewi/head checking for gcc... C:/cygwin64/home/tewi/head/inplace/mingw/bin/gcc.exe checking whether the C compiler works... no configure: error: in `/home/tewi/head': configure: error: C compiler cannot create executables See `config.log' for more details I have gcc installed under Cygwin, but for some reason ./configure is looking for an in-tree compiler. I tried passing --with-gcc=/usr/bin/gcc to configure but with no result. Help? Janek