build errors for fetchmail-6.4.8

Hello,

I'm trying to compile fetchmail version 6.4.8.

Here are a few lines before it quits:

/opt/openssl/include/openssl/x509v3.h:166: undefined reference to
`OPENSSL_sk_num'
socket.o: In function `sk_GENERAL_NAME_value':
/opt/openssl/include/openssl/x509v3.h:166: undefined reference to
`OPENSSL_sk_value'
socket.o: In function `sk_GENERAL_NAME_free':
/opt/openssl/include/openssl/x509v3.h:166: undefined reference to
`OPENSSL_sk_free'
socket.o: In function `SSLOpen':
/home/drip/src/fetchmail/fetchmail-6.4.8/socket.c:1077: undefined
reference to `OpenSSL_version_num'
socket.o: In function `OSSL110_proto_version_logic':
/home/drip/src/fetchmail/fetchmail-6.4.8/socket.c:983: undefined
reference to `TLS_client_method'
socket.o: In function `SSLOpen':
/home/drip/src/fetchmail/fetchmail-6.4.8/socket.c:1138: undefined
reference to `SSL_CTX_set_options'
/home/drip/src/fetchmail/fetchmail-6.4.8/socket.c:1206: undefined
reference to `SSL_get0_param'
/home/drip/src/fetchmail/fetchmail-6.4.8/socket.c:1208: undefined
reference to `X509_VERIFY_PARAM_set_hostflags'
/home/drip/src/fetchmail/fetchmail-6.4.8/socket.c:1209: undefined
reference to `X509_VERIFY_PARAM_set1_host'

What should I try?

Thanks for any suggestions.

     -- Peter