=> Bootstrap dependency digest>=20010302: found digest-20160304
=> Fetching ndisc6-1.0.3.tar.bz2
=> Total size: 260294 bytes
Certificate verification failed for /C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
34374371912:error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed:/usr/src/crypto/openssl/ssl/s3_clnt.c:1269:
fetch: http://www.remlab.net/files/ndisc6/ndisc6-1.0.3.tar.bz2: Authentication error
fetch: Unable to fetch expected file ndisc6-1.0.3.tar.bz2
ndisc6-1.0.3.tar.bz2                                     0  B    0  Bps
=> Checksum SHA1 OK for ndisc6-1.0.3.tar.bz2
=> Checksum RMD160 OK for ndisc6-1.0.3.tar.bz2
=> Checksum SHA512 OK for ndisc6-1.0.3.tar.bz2