I finally found the problem. In the system.xmp file the line:
LinkOpt: #IF# strcmp(get(b,'type'),'xps_lwip') #LinkOpt: -llwip4
should be:
LFlags: #IF# strcmp(get(b,'type'),'xps_lwip') #LFlags: -llwip4

I have updated the SVN.

Thanks for helping/letting me think out loud to solve this.
Glenn

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