=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Fetching cmake-3.16.2.tar.gz
=> Total size: 9109837 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://cmake.org/files/v3.16/cmake-3.16.2.tar.gz: Authentication error
fetch: Unable to fetch expected file cmake-3.16.2.tar.gz
fetch: http://cdn.NetBSD.org/pub/pkgsrc/distfiles/cmake-3.16.2.tar.gz: Not Found
fetch: Unable to fetch expected file cmake-3.16.2.tar.gz
fetch: http://ftp6.NetBSD.org/pub/pkgsrc/distfiles/cmake-3.16.2.tar.gz: Not Found
fetch: Unable to fetch expected file cmake-3.16.2.tar.gz
fetch: http://ftp.fr.NetBSD.org/pub/pkgsrc/distfiles/cmake-3.16.2.tar.gz: Not Found
fetch: Unable to fetch expected file cmake-3.16.2.tar.gz
fetch: http://ftp.NetBSD.org/pub/pkgsrc/distfiles/cmake-3.16.2.tar.gz: Not Found
fetch: Unable to fetch expected file cmake-3.16.2.tar.gz
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/devel/cmake