Ruby 2.0.0 compilation fails to compile on cygwin. (curses.so)
Using RVM we see that ruby fails to compile for 2.0.0. This seems to be fixed in 2.1.0.
Compiling the 2.1.0 as follows succeeds:
rvm --debug install 2.1.0 --without-tcl --without-tk
Trying the same for 2.0.0 fails. With errors logged in the following gist: https://gist.github.com/dajoen/8933735#file-second-attempt-modified-diff-file
A history of events can also be seen in https://github.com/wayneeseguin/rvm/issues/2360.