- add short section about offline-builds

 -Erik

Offline build:

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In order to do an offline-build (not connected to the net), fetch all

selected source by issuing a

$ make source

before you disconnect.

If your build-host is never connected, then you have to copy buildroot

and your toplevel .config to a machine that has an internet-connection

and issue "make source" there, then copy the content of your dl/ dir to

the build-host.

More finegrained configuration:

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