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A rebuild of ldns-1.7.1-7.el9 fails with this error:

./dnssec_sign.c: In function 'ldns_pkey_is_ecdsa':
./dnssec_sign.c:420:26: error: 'key' undeclared (first use in this function); did you mean 'pkey'?
  420 |         if(EVP_PKEY_type(key->type) != EVP_PKEY_EC)
      |                          ^~~
      |                          pkey

Looking at the context:

#ifdef HAVE_EVP_PKEY_BASE_ID
        if(EVP_PKEY_base_id(pkey) != EVP_PKEY_EC)
                return 0;
#else
        if(EVP_PKEY_type(key->type) != EVP_PKEY_EC)
                return 0;
#endif

This happens because HAVE_EVP_PKEY_BASE_ID is not set:

checking for EVP_PKEY_base_id... no

AC_CHECK_FUNCS in configure.ac does not work for preprocessor macros, and EVP_PKEY_base_id is a preprocessor macro in OpenSSL 3.0.

Upstream Git appears to have a patch: https://github.com/NLnetLabs/ldns/commit/12ab6f7a408cd99e9b43b7db86724c2ee66bc36e

Build: https://kojihub.stream.rdu2.redhat.com/koji/taskinfo?taskID=760354

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (new packages: ldns), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:2497