Whenever you need hard-core details on the internals of the SSL API, look
inside this header file.
-OPENSSL_VERSION_AT_LEAST(major,minor) can be
-used in C<#if> statements in order to determine which version of the library is
-being used. This can be used to either enable optional features at compile
-time, or work around issues with a previous version.
-See L<OPENSSL_VERSION_NUMBER(3)>.
-
=item B<ssl2.h>
Unused. Present for backwards compatibility only.