See build.log attached, I'm not adding emerge --info because this is clearly caused by deprecated stuff since gtk+-2.20. Btw, you need to use the ebuild & patch from bug 317275 to actually get this far with the build :-)
Created attachment 236607 [details] build.log
Created attachment 236613 [details, diff] kazehakase-0.5.8-gtk220.patch gtk 2.20 patch from upstream
The correct fix for us is obviously not passing -DGTK_DISABLE_DEPRECATED, as applications can't predict the future...
If I don't misremember, www-client/kazehakase is masked for removal, not?
Yes. I left the comment for anyone who wants to revive it...
sorry for long long delay I agree to mask kazehakase.
Removed from tree for now.