Its the same issue as bug 391431. A patch was applied to make it use -fpic, but s390x needs -fPIC instead
ugh, i failed at that one http://sources.gentoo.org/gentoo/src/patchsets/binutils/2.22/40_all_binutils-2.22-s390x-PIC.patch?r1=1.1&r2=1.2
should be all set now in the tree; thanks for the report! Commit message: Build with -fPIC on s390x http://sources.gentoo.org/sys-devel/binutils/binutils-2.22-r1.ebuild?r1=1.13&r2=1.14