Require OpenSSL 1.1.0 or later (Drop support for 1.0.2) #839
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These macros do not exist in OpenSSL 0.9.7 or later, which was released in 2002.
Drop support for OpenSSL 1.0.2. It has reached upstream EOL in 2019-12.
Most distributions that shipped with OpenSSL 1.0.2 have also reached
EOL, or provide a newer version in the package repository:
- RHEL 7 (EOL 2024-06)
- Ubuntu 16.04 LTS (EOL 2021-04)
- Amazon Linux 2 (EOL 2026-06, but OpenSSL 1.1.1 can be installed via
the openssl11{,-devel} package)
The dir_config was introduced by Ruby trunk r4181. Since support for Kerberos cipher suites has been removed in OpenSSL 1.1.0, it is no longer necessary. Although ruby/openssl did not directly depend on the MIT Kerberos library, it was an optional transitive dependency. Unless it was disabled by a compile-time option, the OpenSSL headers would try to include <krb5.h>.
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This is part 2 of 3 for #835. This PR contains the largest diff, removing around 600 lines of code.