Gentoo's Bugzilla –
Attachment 636890 Details for
Bug 721664gnustep-base/gnustep-base-1.26.0-r1 with gnustep-base/gnustep-make[libobjc2,native-exception] - ../../Headers/Foundation/NSException.h:48:2: error: "gnustep-base is configured to use 'traditional' exceptions, but you are building for 'native' exceptions."