Preventing portmaster from using packages for specified ports

[Mike Clarke]

I'm happy to use the -P option to let portmaster use packages for most 
of my ports but there's a few that must be compiled from the port 
instead because I need to configure non default options, e.g. to enable 
GIMP plugin support in graphics/xsane

Is there any way of forcing portmaster to never use packages for certain 
specified ports?

-- 
Mike Clarke