I moved the prndg pool to /var/spool/prndg/pool and attempted to configure OpenSSH with the above command, but always got the error "PRNG not seeded" when trying to run sshd. Leaving the prngd pool in one of the default places (/var/run/egd-pool), sshd runs without problem. Using the configure option worked in 3.4p1 and i have only just upgraded to 3.7.1p2 to find this issue.
I think your OpenSSL has found the prngd socket and considers itself to be "self-seeded". This would cause OpenSSH's random helper (which is what uses the prngd socket) to not be built at all. When you configure OpenSSH, what do the "Random number source:" and "ssh-rand-helper collects from" lines on the summary display say? I suspect you just need to add "--with-rand-helper" to your configure command to build the random helper despite what OpenSSL claims.
Please reopen if configuring --with-rand-helper doesn't solve it.
Mass change of RESOLVED bugs to CLOSED