I'm not sure what do you mean by "you can compile the vst/.au/whatever with it".If you want to distribute a plugin that use externals without compiling Camomile, I guess one solution would be to ship a Pd distribution with the externals in the plugin bundle and use the [pd~] object to start a process with this embedded Pd binary (that would be able to load the external). Or you can ask the user to install Pd and the required externals if you don't want to ship a complete Pd distribution with the plugin.