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The PKCS5 functionality in jruby-openssl depends on krypt, but the gem does not specify that dependency.
We can't simply add it, either, since krypt only supports Ruby compat 1.9.3 and higher.
If we add it, it will fail to install on JRuby 1.6. Are we ready to do that?
Krypt will be eliminated in 0.9.6 (OpenSSL::PKCS5 functionality implemented using Java), thus not relevant