Research Clarify build parameters

[Shoka]

I have a supported build host running, and successfully building and testing  kernels for a few targets that I have examples of.

 

I'm looking to extend my repertoire to building complete armbian images. 

I think I also want to use EXTERNAL and/or  EXTERNAL_NEW to configure additional packages into the image.

 

This has led me to this stanza:

 

BUILD_MINIMAL (yes|no):

set to “yes” to build bare CLI image suitable for application deployment. This option is not compatible with BUILD_DESKTOP=”yes” and BUILD_EXTERNAL=”yes”

 

I can find no BUILD_EXTERNAL referenced elsewhere, should this be simply EXTERNAL ? or have I missed something.

 

Is there documentation on how EXTERNAL and EXTERNAL_NEW  parameters are invoked?

 

Harry