I released NixNote 1.3 earlier this week, so everything for 1.3 should be released. Just a reminder that the 1.2 and earlier versions will eventually stop working with Evernote. Evernote is discontinuing support for the userid/password authentication that is used in older versions. The last I heard it would be dropped in November, but I don't have a guaranteed date.
Most Linux distributions seem to require you to have 0.9.8 installed for NixNote to work properly (although some distros work with versions > 1.0). If you get any odd errors, please install OpenSSL 0.9.8 and try again.
If you are using OS-X, I don't know exactly what is needed. Unfortunately I can't test it since I don't have a Mac.