error configuring PHP 5.0.3 on Tru64

I am upgrading our PHP to 5.0.3. Looking forward to using the new exception handling features! I get an error during the configure command: ./configure \ --prefix=/apps/php-5.0.3 \ --with-apache=../apache_1.3.31 \ --with-config-file=/apps/apache/conf \ --with-oci8=/apps/oracle/product/9.2.0 \ --with-gdbm \ --with-xml \ --disable-libxml \ --enable-track-vars \ --enable-ftp \ --enable-force-cgi-redirect \ --enable-memory-limit=yes ... checking whether to enable DBA... no checking for QDBM support... no configure: error: DBA: Could not find necessary header file(s). I have tried this configuration on several systems. It works well on Redhat, but fails under Tru64. Here are two of the configurations that failed with identical errors: OS: Tru64 V5.1A Apache: 1.3.31 PHP: 5.0.3 Oracle: 9.2.0.4 OS: Tru64 V4.0F Apache: 1.3.31 PHP: 5.0.3 Oracle: 8.1.7.4 Thanks for your help. -- Carolyn Audilet Rincon Research Corporation P.S. The Tru64 systems apparently do not have the libxml2 libraries. Thus, I had to disable the option. What capability does this new library add?