Cygwin:
- There is no uninstall target in the makefile if you install Ruby from sources. This is probably not the case with Cygwin alone.
- Attempting to install Gems failed saying that it couldn't find the file md5.so, although the file was very much there.
- Suse ships with Ruby 1.8.1; this is no good because Rails needs 1.8.2. Back to installing from the sources.
- Attempting to install Gems failed saying that SSL was not installed, even though it very much was (see a pattern here?). I fixed this by installing a newer version of Rake (whatever that is), though there were some documentation-related errors. Anyway, reinstalling Gems with 1.8.2 went through without any problems.