coreutils-7.6 has a build problem relating to tempname. It seems a patch already made it to gnulib so I've copied that patch to coreutils here. It's not mint specific, but mint bumped into this.
Created attachment 205471 [details, diff] fix coreutils-7.6 build problem with mktemp patch that fixes build problem that should be added to the ebuild.
thanks, added it