FR3.1.x head fails to build on RHEL 6.6

Hello After downloading the head version of FR3.1.x it first complained that gcc was lacking C11, so I downloaded the devtoolset-2 rpms from RedHat devtoolset-2-gcc-4.8.2-15.1.el6.x86_64.rpm devtoolset-2-gcc-c++-4.8.2-15.1.el6.x86_64.rpm devtoolset-2-runtime-2.1-4.el6.noarch.rpm devtoolset-2-libstdc++-devel-4.8.2-15.1.el6.x86_64.rpm Now the configure succeeds with /opt/rh/devtoolset-2/root/usr/bin in the path, but when starting the make it fails to compile debug.c CC src/lib/debug.c /tmp/ccuawyBs.s: Assembler messages: /tmp/ccuawyBs.s:581: Error: expecting string instruction after `rep' make: *** [build/objs/src/lib/debug.lo] Error 1 Any idea what other dependencies I would need to upgrade (make?) to build on RHEL?