Set CONFIG_SHELL to PERL5. Next step is skipping license acceptance
(pkgsrc does this for the user, obviously).
Import mysql55-proxy-0.8.3 as wip/mysql-proxy.

MySQL Proxy is a simple program that sits between your
client and MySQL server(s) that can monitor, analyze or
transform their communication. Its flexibility allows
for a wide variety of uses, including load balancing;
failover; query analysis; query filtering and
modification; and many more.
Add mysql-proxy