make[4]: *** No targets specified and no makefile found. Stop.
make[3]: *** [hackrf/firmware/hackrf_usb/CMakeFiles/libopencm3_hackrf_usb.dir/build.make:112: hackrf/firmware/hackrf_usb/libopencm3_hackrf_usb-prefix/src/libopencm3_hackrf_usb-stamp/libopencm3_hackrf_usb-build] Error 2
make[2]: *** [CMakeFiles/Makefile2:244: hackrf/firmware/hackrf_usb/CMakeFiles/libopencm3_hackrf_usb.dir/all] Error 2
make[1]: *** [CMakeFiles/Makefile2:691: firmware/CMakeFiles/firmware.dir/rule] Error 2
make: *** [Makefile:326: firmware] Error 2