app-text/html-xml-utils-4.3 was released on 2007-12-11.
html-xml-utils-4.5 was released on 2008-02-12. Renaming app-text/html-xml-utils-3.7.ebuild works for me. Further, please add ~amd64 keyword (compiles for me).
app-text/html-xml-utils-4.7 was released on 2008-08-17.
+ 15 Feb 2009; Patrick Lauer <patrick@gentoo.org> + +html-xml-utils-4.7.ebuild: + Bump to 4.7, new dep on gperf, added ~amd64 keyword