when trying to create sfx archive from a given rar archive through standard rar sfx arachive.rar rar is not able to find sfx header. studing closely the whole thing, rar searches for file /usr/local/etc/fx while the installed file is /usr/local/etc/default.sfx adding "dosym /usr/local/etc/default.sfx /usr/local/etc/fx" into ebuild should solve the bug.
We won't symlink anything in(to) /usr/local, that's plain wrong location and we don't install anything there. Unless you have some other solution that doesn't touch /usr/local, ask usptream to fix it.
/usr/local/etc/ is hardcoded in binary. so if we cant touch there,it seems this bug cant be now fixed. you are right /usr/local/etc/default.sfx was not done by ebuild. my mistake.