normally you donīt copy the externals manually, the ones which are used in your patch are included automatically when building a standalone.
So if you donīt want to include every external included in max/msp/jitter in your application, you have to figure out which objects are being used, find their location and then copy them manually.
So what I have asked cycling74 as a feature request is the option of being able to exclude only one external (like the jig.gl.syphon object) from the build process, and then add that manually afterwards.
v002
