Created attachment 350330 [details] build.log Just as said in summary. Build.log attached
$ grep vigra enblend-4.1.1.ebuild >=media-libs/vigra-1.8.0 $ which version of vigra do you have installed? works fine here on stable amd64 with vigra-1.8.0. and also please add emerge --info.
Can not reproduce it right now. Possibly some failure from my side.