If you are using shared libraries the Compaq compiler will attempt
to link to these first. This means that if you have a previous installation
you could experience link errors because the loader is looking at the old
libraries and not the ones you have just built.

e.g. When compiling slapd, you could get...

ld:
        Unresolved:
        ldap_pvt_tls_init
        ldap_pvt_tls_init_def_ctx
        ldap_pvt_tls_accept
        ldap_pvt_tls_get_peer
        ldap_pvt_tls_get_strength
        ldap_pvt_tls_sb_ctx
        ldap_pvt_tls_set_option
        ldap_pvt_tls_get_option

You should bear this in mind when building shared libraries or you can avoid
this type of problem entirely by using only static libraries,
i.e. configure with "--enable-shared=no".