Docs build error in alpha1

I'm hacking up our build framework to allow us to build installers for
the upcoming alpha2 release. When I install the Linux port, I'm seeing
the following failure:

Writing dblink_build_sql_insert.1 for refentry(contrib-dblink-build-sql-insert)
Writing dblink_build_sql_delete.1 for refentry(contrib-dblink-build-sql-delete)
Writing dblink_build_sql_update.1 for refentry(contrib-dblink-build-sql-update)
rm ./man1/dblink*
rm: cannot remove `./man1/dblink*': No such file or directory
make[3]: *** [man-stamp] Error 1
make[3]: Leaving directory
`/mnt/hgfs/pginstaller-repo/DevServer/source/postgres.linux/doc/src/sgml'
make[2]: *** [install] Error 2make[2]: Leaving directory
`/mnt/hgfs/pginstaller-repo/DevServer/source/postgres.linux/doc/src'

make[1]: *** [install] Error 2
make[1]: Leaving directory
`/mnt/hgfs/pginstaller-repo/DevServer/source/postgres.linux/doc'
make: *** [install] Error 2


The dblink man pages all appear to be in doc/src/sgml, not
doc/src/sgml/man1.  If I stick a dummy file in there to satisfy the rm
command, the installation runs to completion, though there are no
dblink man pages in the installation directory.

I'm not sure what's going on here (or, what's intended to be going
on). Any hints?

-- 
Dave Page
EnterpriseDB UK:   http://www.enterprisedb.com