I've just got a new laptop (the old one's hard disk died) so I'm trying to get to the point of being able to build GHC again. I'm currently stuck here: ./configure configure: loading site script /usr/local/etc/config.site checking for gfind... no checking for find... /usr/bin/find checking for sort... /usr/bin/sort checking for GHC version date... inferred 8.5.20180323 checking for GHC Git commit id... inferred affdea82bb70e5a912b679a169c6e9a230e4c93e checking for ghc... /c/fp/HP-8.2.2/bin/ghc checking version of ghc... 8.2.2 GHC path canonicalised to: c:/fp/HP-8.2.2/bin/ghc checking build system type... x86_64-pc-msys checking host system type... x86_64-pc-msys checking target system type... x86_64-pc-msys Unknown OS msys Any ideas? Thanks Simon