libgtkhtml-3.0.10 is a direct dep of gtkhtml-sharp-1.0.4, and gal-1.99.11 is an indirect dep. Both of those packages are installed slotted so they don't disturb more recent versions which are usually already present. Question is: is it really necessary to depend on those specific versions? I successfuly compiled gtkhtml-sharp-1.0.4 with libgtkhtml-3.2.3 and gal-2.2.3. configure and compile don't seem to need a lower version. I don't know what app uses currently gtkhtml-sharp so I can test it... f-spot does, but I couldn't get it to work....
latexer... same is true for gtkhtml-sharp-1.0.6 ;)
Fixed in portage to depend on either slot, taking the newer one preferably over the older one.