when compiling libcurl 7.23.1 againt cyassl 2.0.0rc3 it does not compile.
in the function Curl_cyassl_init there is a call to InitCyaSSL which is not present anymore.
SSL_library_init should be used instead.
Thanks for the report, this problem is now fixed in the git repository.
To try it out, you either checkout/update your git clone: http://curl.haxx.se/source.html
or you try tomorrow's daily snapshot: http://curl.haxx.se/snapshots/