=> Bootstrap dependency digest>=20010302: found digest-20160304
=> Fetching libvpx-1.6.0.tar.gz
=> Total size: 2476097 bytes
ftp: Error retrieving file `404 Not Found'
fetch: Unable to fetch expected file libvpx-1.6.0.tar.gz
=> Checksum SHA1 OK for libvpx-1.6.0.tar.gz
=> Checksum RMD160 OK for libvpx-1.6.0.tar.gz
=> Checksum SHA512 OK for libvpx-1.6.0.tar.gz