Old Ruby, mismatched OpenSSL

[pointlessone]

Steps to reproduce the behavior

rbenv install 2.6.10

Details

The build fails with mismatched OpenSSL error.

• I have both openssl@1.1 and openssl@3 installed in homebrew
• I run macOS Sonoma 14.2
• I have ruby-build installed through homebrew, version 20231107

ruby-build seem to correctly detect openssl@1.1:

-> ./configure "--prefix=$HOME/.rbenv/versions/2.6.10" --enable-shared --with-readline-dir=/usr/local/opt/readline --with-libyaml-dir=/usr/local/opt/libyaml --with-gmp-dir=/usr/local/opt/gmp --with-openssl-dir=/usr/local/opt/openssl@1.1

But this somehow gets lost during compilation phase:

compiling ossl.c
ossl.c:311:14: error: 'ERR_get_error_line_data' is deprecated [-Werror,-Wdeprecated-declarations]
        while ((e = ERR_get_error_line_data(&file, &line, &data, &flags))) {
                    ^
/usr/local/Cellar/openssl@3/3.1.4/include/openssl/err.h:424:1: note: 'ERR_get_error_line_data' has been explicitly marked deprecated here
OSSL_DEPRECATEDIN_3_0
^
/usr/local/Cellar/openssl@3/3.1.4/include/openssl/macros.h:193:49: note: expanded from macro 'OSSL_DEPRECATEDIN_3_0'
#   define OSSL_DEPRECATEDIN_3_0                OSSL_DEPRECATED(3.0)
                                                ^
/usr/local/Cellar/openssl@3/3.1.4/include/openssl/macros.h:62:52: note: expanded from macro 'OSSL_DEPRECATED'
#     define OSSL_DEPRECATED(since) __attribute__((deprecated))
                                                   ^
1 error generated.

Logs

Full log

[mislav]

Thank you for reporting. It looks like ruby-build does its job correctly, but Ruby 2.6 ignores the --with-openssl-dir passed to it. If you temporarily brew unlink openssl@3, does the problem go away?

Was this a problem for you before the latest release of ruby-build?

[mislav]

Some more information here: #2125 (comment)

Closing as there is more evidence that is a problem of the Ruby 2.6 build system, which makes the brew unlink openssl@3 workaround more likely to have effect.

[pointlessone]

Unlinking newer openssl does fix the issue. Thank you.

[mislav]

I found a way that works even without unlinking openssl@3:

CFLAGS="-DUSE_FFI_CLOSURE_ALLOC" PKG_CONFIG_PATH="$(brew --prefix openssl@1.1)/lib/pkgconfig" rbenv install 2.6.10 -- --with-openssl-dir="$(brew --prefix openssl@1.1)"