try attach_variable.

e.g.

module Foo

  # std library stuff here

  # ...

  # Attach C global LEA_SERVER as ruby variable lea_server

  attach_variable :lea_server, :LEA_SERVER, :pointer

end

Then use it like so:

Foo.opsec_init_entity(env, Foo.lea_server, Foo::OPSEC_EOL);