complie postgresql with kerberos in centos

Hi readers,

I have problem in compiling of postgresql with krb5 in CentOS;

My compiling statement is :
./configure --with-krb5 --without-readline --without-zlib --with-openssl
--with-ldap
because of the fact that Postgresql need ldap in compile with krb5, I have
to add --with-openssl , --with-ldap parameters in configuration.
On the other hand, using this parameters in configuration, is send
following error:
" checking for SSL_library_init in -lssl... no
configure: error: library 'ssl' is required for OpenSSL"

Please help me.

Thanks
Miss.R.KH