The problem lies with the Perl script, not the C program.
The perl script generates the file 17-renegotiate.cnf.default from the template file 17-renegotiate.cnf.in.
The environment variable “${ENV::TEST_CERTS_DIR}” should have been replaced by Perl.
Please open an issue on GitHub, it’s easier to discuss your problem there. You might want to tag @levitte, he should be able to help.
https://github.com/openssl/openssl/issues/new/choose
Matthias
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