build.fsx

        let file' =
          try
            let result = ExecProcessAndReturnMessages (fun info ->
              info.FileName <- "cygpath"
              info.Arguments <- file) (TimeSpan.FromSeconds 5.0)

            if result.OK then
              trace <| sprintf "Translated Windows path %s to Cygwin path %s" file result.Messages.[0]
              result.Messages.[0]
            else
              file
          with
          | _ -> trace <| sprintf "Failed to run cygpath, likely not a Cygwin environment"; file

        gitCommand "" ("update-index --assume-unchanged " + file')