=head1 HISTORY
-CRYPTO_set_locking_callback() and CRYPTO_set_id_callback() are
+CRYPTO_set_locking_callback() is
available in all versions of SSLeay and OpenSSL.
CRYPTO_num_locks() was added in OpenSSL 0.9.4.
All functions dealing with dynamic locks were added in OpenSSL 0.9.5b-dev.