dovecot -2.2.24 on Fedora 31

[Frank Elsner]

Hi,

I try to compile dovecot -2.2.24 on Fedora 31 and get the following error:

iostream-openssl.c: In function ‘openssl_iostream_verify_client_cert’:
iostream-openssl.c:118:37: error: dereferencing pointer to incomplete type ‘X509_STORE_CTX’ {aka ‘struct x509_store_ctx_st’}
  118 |  subject = X509_get_subject_name(ctx->current_cert);
      |                                     ^~
make[3]: *** [Makefile:561: iostream-openssl.lo] Error 1

All openssl packages installed. What's the reason and how solve the problem?

Kind regards, 
Frank Elsner