Which Crypto Library to Use

1. cppcrypto is fast, but source is  in another remote repository system (sourceforge).
2. Current master branch of openSSL supports scrypt and pbkdf2, slow with default compiling options.
3. Some other, Implement you own ?

openSSL feels like the best option, speed is not critical.
 
cppcrypto has support for Argon2 that according to some studies is better than Scrypt.