media-sound/terminatorx has DEPEND on dev-libs/libxml but actually depends on dev-libs/libxml2. From the build log: $ grep xml /var/log/portage/media-sound:terminatorx-3.82:20090814-071949.log checking for xml2-config... xml2-config checking for libxml >= 2.3.9... yes manual: \"/usr/share/terminatorX/doc/terminatorX-manual/C/terminatorX-manual.xml\" if x86_64-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I. -I.. -I/usr/include/libxml2 -march=core2 -mtune=core2 -O2 -pipe -fweb -frename-registers -fomit-frame-pointer -fno-ident -ggdb -DXML_MANUAL=\"/usr/share/terminatorX/doc/terminatorX-manual/C/terminatorX-manual.xml\" -I/usr/include/gtk-2.0 -I/usr/lib64/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -D_REENTRANT -I/usr/include/libxml2 -march=core2 -mtune=core2 -O2 -pipe -fweb -frename-registers -fomit-frame-pointer -fno-ident -ggdb -DXML_MANUAL=\"/usr/share/terminatorX/doc/terminatorX-manual/C/terminatorX-manual.xml\" -MT tX_endian.o -MD -MP -MF ".deps/tX_endian.Tpo" -c -o tX_endian.o tX_endian.c; \
done