Apparently, the stock opencv on my Raspberry Pi 3 does not include the nonfree.hpp library. Recommendation is to compile opencv from source on the Raspberry Pi. That seems to require a source compile of Qt5... Uge, that's a 24 hour or longer compile because the Raspberry Pi 3 is only a 1.2 Ghz quad core with 1 gig of ram. I need to do cross compiling on a more powerful Linux based system. I have a Fedora 26 box with an AMD FX processor, 8 cores total. How can I compile for the Raspberry Pi 3 Model B on my system that is more powerful and that has more hard disk space available? I'm working with a 32gb SD card that is 50% full right now. _______________________________________________ PLUG mailing list PLUG@lists.pdxlinux.org http://lists.pdxlinux.org/mailman/listinfo/plug