LKGBuild was 9590.0.0 I think this is the CL or series that may have broken it.

The failure is the following:

depthcharge-0.0.1-r1792: build/external/vboot/vboot_fw.a(vboot_display.o): In function `VbDisplayMenu':
depthcharge-0.0.1-r1792: /build/gale/tmp/portage/sys-boot/depthcharge-0.0.1-r1791/work/depthcharge-0.0.1/vboot_reference/firmware/lib/vboot_display.c:403: undefined reference to `VbExDisplayMenu'
depthcharge-0.0.1-r1792: collect2: error: ld returned 1 exit status

I think this is the CL that may be at fault: https://chromium-review.googlesource.com/c/457863/

Assigning to shchen@