app-arch/dar should use emake function to build. Of course this might lead to crashes if one specified parallel make i.e. MAKEOPTS="-j2" or bigger Therefore you should replace -j[2 or bigger] with -j1 for MAKEOPTS directly in the ebuild The developer is informed that parallel making leads to crashes, maybe he will adapt it see dar bug report https://sourceforge.net/tracker/index.php?func=detail&aid=1113451&group_id=65612&atid=511612
fixed in dar-2.2.1