build-user@talos:~/ungoogled-chromium-ppc64le/build/src$ ninja -C out/Default chrome chromedriver chrome_sandbox
ninja: Entering directory `out/Default'
ninja: error: '../../third_party/libvpx/source/libvpx/vp8/common/copy_c.c', needed by 'obj/third_party/libvpx/libvpx/copy_c.o', missing and no known rule to make it