PostgreSQL with SSL

Greetings list.
I'm trying to upgrade my PostgreSQL 8.1.0 instalation in Red Hat Linux 9 (
PostgreSQL 8.1.0 on i686-pc-linux-gnu, compiled by GCC gcc (GCC)
3.2.220030222 (Red Hat Linux
3.2.2-5) ) to version 8.1.4 cause of security patch just released.

Now I want to increase security in my connections to my database
implementing SSL. I've already installed OpenSSH openssl-0.9.8b, but when
configuring postgres ( ./configure --with-openssl ) I get the following
error:

[...]
checking openssl/ssl.h usability... no
checking openssl/ssl.h presence... no
checking for openssl/ssl.h... no
configure: error: header file <openssl/ssl.h> is required for OpenSSL

The file is located in /usr/local/include/openssl/ssl.h

I also copied the whole directory to [pgsrcdir]/include/openssl and the
error remains.

I've also tried this:
http://archives.postgresql.org/pgsql-admin/2003-11/msg00429.php and then I
get this new error:

[...]
checking for library containing com_err... no
configure: error: could not find function 'com_err' required for Kerberos 5

Any idea about what am I doing wrong ? Have anybody compiled postgres with
SSH in Red Hat 9 ? Thanks.