Chris πŸ‡ΉπŸ‡Ό | Telegram ε°Όζœ‰δΊ‹ε—Ž says to YSITD
ζ˜―ε› η‚Ίι€™ε€‹ OpenSSL 1.0.2 or above. BoringSSL 4fac72e or above. LibreSSL is not supported as it doesn't provide either of the functions used to add the signed_certificate_timestamp extension to the response (SSL_CTX_add_server_custom_ext and SSL_CTX_set_signed_cert_timestamp_list).