util-vserver debian build warnings util-vserver 0.30.216-pre3004

hello,

  i just built packages for debian on : util-vserver 0.30.216-pre3004

  I got some warning so i thinked perhaps it could be interesting for 
you to know:

dpkg-shlibdeps: warning: 
debian/util-vserver-python/usr/lib/pyshared/python2.6/_libvserver.so 
contains an unresolvable reference to symbol Py_BuildValue: it's 
probably a plugin.
dpkg-shlibdeps: warning: 12 other similar warnings have been skipped 
(use -v to see them all).
    dh_installdeb
    dh_gencontrol
dpkg-gencontrol: warning: Depends field of package util-vserver: unknown 
substitution variable ${shlibs:Depends}
dpkg-gencontrol: warning: Depends field of package util-vserver-core: 
unknown substitution variable ${shlibs:Depends}
dpkg-gencontrol: warning: Depends field of package util-vserver-sysv: 
unknown substitution variable ${shlibs:Depends}
dpkg-gencontrol: warning: Depends field of package libvserver0-dev: 
unknown substitution variable ${shlibs:Depends}
dpkg-gencontrol: warning: package util-vserver-python: unused 
substitution variable ${python:Versions}


   created them on debian squeeze 64bits  with:

aptitude install build-essential debhelper  gawk dietlibc-dev 
libnss3-dev po-debconf e2fslibs-dev pkg-config python-dev ctags;
dpkg-buildpackage -rfakeroot;

Regards,
Ghislain.