The ebuild contains the following line - which will make it die whenever the useflag "amd64" is not set - which does not seem intended use amd64 && mv -f coe_linux64bit coe_linux || die "mv amd64 image failed"
Created attachment 181807 [details, diff] coe2-2007.ebuild.diff Patch fixing the issue
fixed. thanks for the bug report.