need help with plphp installation

Hi,

I am getting the following errors while trying to get plphp installed
on postgres 8.5:

ERROR:  could not load library "/usr/local/pgsql/lib/plphp.so":
/usr/local/pgsql/lib/plphp.so: undefined symbol: sapi_globals

********** Error **********

ERROR: could not load library "/usr/local/pgsql/lib/plphp.so":
/usr/local/pgsql/lib/plphp.so: undefined symbol: sapi_globals
SQL state: 58P01

========================
here is what I get with ldd command:

 ldd -r /usr/local/lib/libphp5.so
        linux-vdso.so.1 =>  (0x00007fffa95ff000)
        libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007fbd23614000)
        librt.so.1 => /lib64/librt.so.1 (0x00007fbd2340b000)
        libresolv.so.2 => /lib64/libresolv.so.2 (0x00007fbd231f5000)
        libm.so.6 => /lib64/libm.so.6 (0x00007fbd22f72000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00007fbd22d6e000)
        libnsl.so.1 => /lib64/libnsl.so.1 (0x00007fbd22b55000)
        libxml2.so.2 => /usr/lib64/libxml2.so.2 (0x00007fbd22818000)
        libz.so.1 => /usr/lib64/libz.so.1 (0x00007fbd22604000)
        libc.so.6 => /lib64/libc.so.6 (0x00007fbd222ad000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fbd22092000)
        /lib64/ld-linux-x86-64.so.2 (0x0000003053e00000)
undefined symbol: sapi_globals  (/usr/local/lib/libphp5.so)
undefined symbol: executor_globals      (/usr/local/lib/libphp5.so)
undefined symbol: php_ini_opened_path   (/usr/local/lib/libphp5.so)
undefined symbol: sapi_module   (/usr/local/lib/libphp5.so)
undefined symbol: php_import_environment_variables
(/usr/local/lib/libphp5.so)
undefined symbol: zend_qsort    (/usr/local/lib/libphp5.so)
undefined symbol: module_registry       (/usr/local/lib/libphp5.so)
undefined symbol: php_module_shutdown_wrapper   (/usr/local/lib/libphp5.so)
undefined symbol: zend_error    (/usr/local/lib/libphp5.so)
undefined symbol: xmlwriter_module_entry        (/usr/local/lib/libphp5.so)
undefined symbol: libxml_module_entry   (/usr/local/lib/libphp5.so)
undefined symbol: dom_module_entry      (/usr/local/lib/libphp5.so)
undefined symbol: xmlreader_module_entry        (/usr/local/lib/libphp5.so)
undefined symbol: xml_module_entry      (/usr/local/lib/libphp5.so)

Any help will be greatly appreciated.

p