If curl was built with support for "MultiSSL", meaning that it has built-in
support for more than one TLS backend, this environment variable can be set to
the case insensitive name of the particular backend to use when curl is
-invokved. Setting a name that isn't a built-in alternative, will make curl
+invoked. Setting a name that isn't a built-in alternative, will make curl
stay with the default.
.IP "QLOGDIR <directory name>"
If curl was built with HTTP/3 support, setting this environment variable to a