mysql56: Cannot create database at end of installation.

[murrayeisenberg@…]

I installed mysql56-server @5.6.19_1 under OS X 10.9.4.

Following instructions at wiki:howto/MAMP, I executed:

   sudo port select mysql mysql56
   sudo -u _mysql /opt/local/lib/mysql56/bin/mysql_install_db   [NOT "_db5"]

Result:

  WARNING: Could not write to config file /opt/local/etc/mysql56/my-new.cnf: Permission denied
  FATAL ERROR: Could not find /fill_help_tables.sql

I tried doing "chown _mysql:_mysql /opt/local/etc/mysql56/my-new.cnf", which did cure the first error.

However, the 2nd error persist.

In fact, after updating the located, an mdfind reveals:

   mdfind -name fill_help_tables.sql
   /opt/local/share/mysql56/fill_help_tables.sql

So how should this be fixed?