openldap 2.4.33 configure problem - could not locate TLS/ssl package.

All,

can someone help me out? When building openldap 2.4.33, I got the following error "Could not locate TLS/SSL package". did I missed something in openssl? how to fix it? Thanks in advance for your support!

checking openssl/ssl.h usability... yes checking openssl/ssl.h presence... yes checking for openssl/ssl.h... yes checking for SSL_library_init in -lssl... no checking for ssl3_accept in -lssl... no checking gnutls/gnutls.h usability... no checking gnutls/gnutls.h presence... no checking for gnutls/gnutls.h... no checking nssutil.h usability... no checking nssutil.h presence... no checking for nssutil.h... no configure: WARNING: Could not locate TLS/SSL package configure: WARNING: TLS data protection not supported

Thanks, Eric.