hi folks! having trouble installing gentoo's `udev`:

```
./autogen.sh
libtoolize: putting auxiliary files in '.'.
libtoolize: linking file './ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIRS, 'm4'.
libtoolize: linking file 'm4/libtool.m4'
libtoolize: linking file 'm4/ltoptions.m4'
libtoolize: linking file 'm4/ltsugar.m4'
libtoolize: linking file 'm4/ltversion.m4'
libtoolize: linking file 'm4/lt~obsolete.m4'
configure.ac:6: installing './compile'
configure.ac:13: installing './missing'
src/ata_id/Makefile.am: installing './depcomp'
warning: failed to load external entity "http://docbook.sourceforge.net/release/xsl/current/html/biblio-iso690.xsl"
compilation error: file http://docbook.sourceforge.net/release/xsl/current/html/docbook.xsl line 61 element include

...
```

I remember being able to do it with no problems - any ideas?