The current ebuild for amaya is amaya-7.0, and is referring to the url ftp://ftp.w3.org/pub/amaya/amaya-src-7.0.tgz. Anyway, this file is no more available at the specified URL, and has been substituted with the 7.1 version, i.e. amaya-src-7.1.tgz. I think it should be just a matter of changing the ebuild's version, seeing that the ebuild script uses variables for filenames...
amaya 7.1 WON'T build correctly due some link issues (missing libz libpng and libjpeg is some makefiles)
*** Bug 13039 has been marked as a duplicate of this bug. ***
I'll probably have some time to work on getting 7.1 to build this weekend...
source file removed by upstream