I can't succesfully emerge the above mentioned package on a system that only has docbook-xml-dtd-4.4. With an upgrade to 4.5 I could, after a downgrade to 4.4, I again couldn't. Note that the system was installed from binary packages and did not contain a full GNOME install (i.e. not from gnome-base/gnome, only specific packages like gnome-session, gnome-panel, etc... and not from a full-fledged desktop profile). Note: I have noticed issues with docbook-xml-dtd versions before and they're not always fully reproducible. Does an unmerge of docbook-xml-dtd leave files behind that prohibit reproduction? xsltproc -o gnome-volume-control-it.omf --stringparam db2omf.basename gnome-volume-control --stringparam db2omf.format 'docbook' --stringparam db2omf.dtd "-//OASIS//DTD DocBook XML V4.1.2//EN" --stringparam db2omf.lang it --stringparam db2omf.omf_dir "/usr/share/omf" --stringparam db2omf.help_dir "/usr/share/gnome/help" --stringparam db2omf.omf_in "/var/tmp/portage/gnome-extra/gnome-media-2.24.0.1-r1/work/gnome-media-2.24.0.1/gst-mixer/doc/gnome-volume-control.omf.in" `/usr/bin/pkg-config --variable db2omf gnome-doc-utils` it/gnome-volume-control.xml || { rm -f "gnome-volume-control-it.omf"; exit 1; } xsltproc -o gnome-volume-control-oc.omf --stringparam db2omf.basename gnome-volume-control --stringparam db2omf.format 'docbook' --stringparam db2omf.dtd "-//OASIS//DTD DocBook XML V4.1.2//EN" --stringparam db2omf.lang oc --stringparam db2omf.omf_dir "/usr/share/omf" --stringparam db2omf.help_dir "/usr/share/gnome/help" --stringparam db2omf.omf_in "/var/tmp/portage/gnome-extra/gnome-media-2.24.0.1-r1/work/gnome-media-2.24.0.1/gst-mixer/doc/gnome-volume-control.omf.in" `/usr/bin/pkg-config --variable db2omf gnome-doc-utils` oc/gnome-volume-control.xml || { rm -f "gnome-volume-control-oc.omf"; exit 1; } xsltproc -o gnome-volume-control-ru.omf --stringparam db2omf.basename gnome-volume-control --stringparam db2omf.format 'docbook' --stringparam db2omf.dtd "-//OASIS//DTD DocBook XML V4.1.2//EN" --stringparam db2omf.lang ru --stringparam db2omf.omf_dir "/usr/share/omf" --stringparam db2omf.help_dir "/usr/share/gnome/help" --stringparam db2omf.omf_in "/var/tmp/portage/gnome-extra/gnome-media-2.24.0.1-r1/work/gnome-media-2.24.0.1/gst-mixer/doc/gnome-volume-control.omf.in" `/usr/bin/pkg-config --variable db2omf gnome-doc-utils` ru/gnome-volume-control.xml || { rm -f "gnome-volume-control-ru.omf"; exit 1; } http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:115: parser warning : PEReference: %list.class; not found %local.divcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:115: parser warning : PEReference: %admon.class; not found %local.divcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:115: parser warning : PEReference: %linespecific.class; not found %local.divcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:115: parser warning : PEReference: %synop.class; not found %local.divcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:115: parser warning : PEReference: %para.class; not found %local.divcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:115: parser warning : PEReference: %informal.class; not found %local.divcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:115: parser warning : PEReference: %formal.class; not found %local.divcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:115: parser warning : PEReference: %compound.class; not found %local.divcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:115: parser warning : PEReference: %genobj.class; not found %local.divcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:115: parser warning : PEReference: %descobj.class; not found %local.divcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:115: parser warning : PEReference: %ndxterm.class; not found %local.divcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:125: parser warning : PEReference: %list.class; not found %local.refcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:125: parser warning : PEReference: %admon.class; not found %local.refcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:125: parser warning : PEReference: %linespecific.class; not found %local.refcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:125: parser warning : PEReference: %synop.class; not found %local.refcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:125: parser warning : PEReference: %para.class; not found %local.refcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:125: parser warning : PEReference: %informal.class; not found %local.refcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:125: parser warning : PEReference: %formal.class; not found %local.refcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:125: parser warning : PEReference: %compound.class; not found %local.refcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:125: parser warning : PEReference: %genobj.class; not found %local.refcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:125: parser warning : PEReference: %descobj.class; not found %local.refcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:125: parser warning : PEReference: %ndxterm.class; not found %local.refcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:135: parser warning : PEReference: %linespecific.class; not found %local.indexdivcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:135: parser warning : PEReference: %synop.class; not found %local.indexdivcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:135: parser warning : PEReference: %para.class; not found %local.indexdivcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:135: parser warning : PEReference: %informal.class; not found %local.indexdivcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:135: parser warning : PEReference: %link.char.class; not found %local.indexdivcomponent.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:141: parser warning : PEReference: %tech.char.class; not found %local.refname.char.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:156: parser warning : PEReference: %xref.char.class; not found %local.refinline.char.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:156: parser warning : PEReference: %gen.char.class; not found %local.refinline.char.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:156: parser warning : PEReference: %link.char.class; not found %local.refinline.char.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:156: parser warning : PEReference: %tech.char.class; not found %local.refinline.char.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:156: parser warning : PEReference: %base.char.class; not found %local.refinline.char.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:156: parser warning : PEReference: %docinfo.char.class; not found %local.refinline.char.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:156: parser warning : PEReference: %other.char.class; not found %local.refinline.char.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:156: parser warning : PEReference: %ndxterm.class; not found %local.refinline.char.mix;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:204: parser warning : PEReference: %role.attrib; not found <!ENTITY % set.role.attrib "%role.attrib;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:219: parser warning : PEReference: %status.attrib; not found %status.attrib; ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:220: parser warning : PEReference: %common.attrib; not found %common.attrib; ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:230: parser warning : PEReference: %role.attrib; not found <!ENTITY % setinfo.role.attrib "%role.attrib;"> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:236: parser warning : PEReference: %bibliocomponent.mix; not found | keywordset | itermset | %bibliocomponent.mix;)+)> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:236: parser error : ContentDecl : Name or '(' expected | keywordset | itermset | %bibliocomponent.mix;)+)> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:236: parser error : expected '>' | keywordset | itermset | %bibliocomponent.mix;)+)> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:236: parser error : Content error in the external subset | keywordset | itermset | %bibliocomponent.mix;)+)> ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:243: parser warning : PEReference: %setinfo.attlist; not found <![%setinfo.attlist;[ ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:243: parser error : conditional section INCLUDE or IGNORE keyword expected <![%setinfo.attlist;[ ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:243: parser error : Content error in the external subset <!ATTLIST setinfo ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:243: parser error : Content error in the external subset <!ATTLIST setinfo ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:243: validity error : All markup of the conditional section is not in the same entity <!ATTLIST setinfo ^ http://www.oasis-open.org/docbook/xml/4.1.2/dbhierx.mod:243: parser error : Content error in the external subset <!ATTLIST setinfo ^ unable to parse ru/gnome-volume-control.xml make[3]: *** [gnome-volume-control-ru.omf] Error 1 make[3]: Leaving directory `/var/tmp/portage/gnome-extra/gnome-media-2.24.0.1-r1/work/gnome-media-2.24.0.1/gst-mixer/doc' make[2]: *** [all-recursive] Error 1 make[2]: Leaving directory `/var/tmp/portage/gnome-extra/gnome-media-2.24.0.1-r1/work/gnome-media-2.24.0.1/gst-mixer' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/var/tmp/portage/gnome-extra/gnome-media-2.24.0.1-r1/work/gnome-media-2.24.0.1' make: *** [all] Error 2
Meanwhile, I re-installed docbook-xml-dtd-4.5, but gnome-media-2.24.0.1-r1 again fails. This again gives me the impression that there is something fishy about the xml-docbook-dtd packages :-)
First, please backup /etc/xml/catalog somewhere, then reinstall app-text/docbook-xml-dtd:4.1.2 (I assume it already is, otherwise please say so but still continue with these instructions), make a diff between the backup and the new /etc/xml/catalog and attach it here. Then you should be able to build gnome-media. Also, please always include emerge --info & build.log when you report a build failure, it makes it easier for us to check for obvious problems.