[Libreoffice] new download - checking for rpm

Have we lost a patch somewhere? Just trashed my old development
directory by mistake :-) so I'm trying to follow the new download and
build instructions. ./autogen.sh bombs as follows ...

checking whether to enable EPM for packing... yes
checking for epm... no
EPM will be built.
checking which package format to use... rpm
checking for rpm... configure: error: not found
anthony@ashdown ~/gitstuff/loffice $

I thought we'd hit this problem before but I can't find it in my email
archive.

As an aside, I thought autogen retrieved its old arguments from
config.log if you didn't give it any. Does this happen now? I cheated
and copied my old config.log across but it didn't seem to use it ...

Cheers,
Wol