building the docs on Debian

I just tried to build our docs on Debian Squeeze using our instructions
for Debian:

    http://www.postgresql.org/docs/9.1/static/docguide-toolsets.html
    apt-get install docbook docbook-dsssl docbook-xsl openjade1.3 xsltproc

However, it failed on a 'make check' in the sgml directory because there
was no 'nsgmls' executable.  After doing 'apt-get install sp', the make
check worked fine.  Should I add 'sp' to the list of needed Debian
packages in our docs?

--
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +