=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Fetching mesa-19.1.6.tar.xz
=> Total size: 10939908 bytes
Certificate verification failed for /C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
34370572288:error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:/usr/src/crypto/openssl/ssl/statem/statem_clnt.c:1925:
fetch: https://mesa.freedesktop.org/archive/mesa-19.1.6.tar.xz: Authentication error
fetch: Unable to fetch expected file mesa-19.1.6.tar.xz
mesa-19.1.6.tar.xz                                      10 MB 1277 kBps    08s
=> Checksum SHA1 OK for mesa-19.1.6.tar.xz
=> Checksum RMD160 OK for mesa-19.1.6.tar.xz
=> Checksum SHA512 OK for mesa-19.1.6.tar.xz