binutils: relax references to near-zero symbols
Specify your own number of make jobs

We no longer hard-code it in the Makefile.
Consider adding something like the following to your .bashrc:
  export MAKEFLAGS="-j `echo \`nproc\`*3/2|bc`"
gcc: upgrade to 4.9.2

That was surprisingly painless.
glibc: remove unnecessary header