Assertions fail on trivial example

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Hello,

I just tried out xmlroff on a simple example, but failed.
Maybe I did something wrong and you could help me, please?

What I did:

$ xsltproc /usr/share/xml/docbook/stylesheet/nwalsh/fo/docbook.xsl \
  simple.dbk > simple.fo
$ xmlroff simple.fo
(process:32210): libfo-CRITICAL **: fo_region_body_get_writing_mode: asse=
rtion
`fo_region_body !=3D NULL' failed
(process:32210): libfo-CRITICAL **: fo_region_body_area_new: assertion `f=
o !=3D
NULL' failed
(process:32210): libfo-CRITICAL **: fo_area_set_generated_by: assertion `=
fo_area
!=3D NULL' failed
(process:32210): libfo-CRITICAL **: fo_area_page_add_child: assertion `ch=
ild !=3D
NULL' failed
(process:32210): libfo-CRITICAL **: fo_node_parent: assertion `fo_node !=3D=
 NULL'
failed
libfo-ERROR **: area_size_request:: parent is NULL
aborting...

The versions of docbook-xml, docbook-xsl, and xsltproc are:

docbook-xml 4.4-5
docbook-xsl 1.68.1.dfsg.1-0.2
xsltproc    1.1.17-1

I have both simple.dbk and simple.fo attached.
I'm running Debian GNU/Linux etch a.k.a. testing.
Please CC me, as I'm not subscribed.

Cheers, W. Borgert

Btw. the packages needed for building xmlroff under Debian are:

libfontconfig1-dev   2.3.2-7
libfreetype6-dev     2.2.1-2
libglib2.0-dev       2.10.2-1
libgnomeprint2.2-dev 2.12.1-4
libgtk2.0-dev        2.8.18-1
libpango1.0-dev      1.12.3-1
libpopt-dev          1.10-2
libxml2-dev          2.6.26.dfsg-1
libxslt1-dev         1.1.17-1

Note, that libgtk2.0-dev is not mentioned in the list at
http://xmlroff.org/building.html, maybe you could add it.
libpopt is used, but not checked for during ./configure,
and also missing in the list.

Note also, that I could not build the package by running
./configure twice - I had to build pangoxsl and "make
install" it first, than xmlroff could be built.

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