curl @7.77.0 [+darwinssl +http2]: cannot reach https websites

[ahrex]

The +darwinssl variant of curl 7.77.0 cannot read https websites:

% curl -v https://www.example.com/
* Protocol "https" not supported or disabled in libcurl
* Closing connection -1
curl: (1) Protocol "https" not supported or disabled in libcurl

% curl --version
curl 7.77.0 (x86_64-apple-darwin20.5.0) libcurl/7.77.0 zlib/1.2.11 zstd/1.5.0 libidn2/2.3.1 libpsl/0.21.1 (+libidn2/2.3.0) nghttp2/1.43.0
Release-Date: 2021-05-26
Protocols: dict file ftp gopher http imap mqtt pop3 rtsp smtp telnet tftp 
Features: alt-svc AsynchDNS HTTP2 IDN IPv6 Largefile libz PSL UnixSockets zstd

% port version
Version: 2.7.1

macOS Big Sur 11.4 (20F71)