Yes, the proper way to do would be to cross-compile your own firmware but at the moment I've not yet figured out how to do it.

But eventually I'll do that.

I had just hoped that I could find a workaround to install the one module I need...

In reply to Re^2: EXTERN.h missing when compiling on OpenWrt by morgon
in thread EXTERN.h missing when compiling on OpenWrt by morgon

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