the last line of this make call is a call to openjade to make the
documentation

[postgres@www sgml]$ make
LC_ALL=C /usr/bin/perl /usr/bin/collateindex.pl -f -g -o bookindex.sgml -N
{ \
echo "<!entity version \"7.5devel\">"; \
echo "<!entity majorversion \"`expr 7.5devel : '\([0-9][0-9]*\.[0-9][0-9]*\)'`\">"; \
} >version.sgml
/usr/bin/perl ./mk_feature_tables.pl YES ../../../src/backend/catalog/sql_feature_packages.txt ../../../src/backend/catalog/sql_features.txt > features-supported.sgml
/usr/bin/perl ./mk_feature_tables.pl NO ../../../src/backend/catalog/sql_feature_packages.txt ../../../src/backend/catalog/sql_features.txt > features-unsupported.sgml
openjade -V draft-mode -wall -wno-unused-param -wno-empty -D . -c /usr/share/sgml/docbook/dsssl-stylesheets/catalog -d stylesheet.dsl -i output-html -t sgml postgres.sgml