as khai suggested, i open a new bug for the 0.4.7 series, beginning with 0.4.7b. btw Park Ji-in yoiu were right, my tarball was broken.
Created attachment 29288 [details] net-www/liferea/liferea-0.4.7b.ebuild
adding cc, sorry for inconvenience.
liferea-0.4.7c is out, renaming the ebuild worked fine for me.
This has been fixed for a while...