clang requires libxlm2, on darwin at least
systemd: porting patches for arm for udev.

Related to our glibc version, probably fixed in newer glibcs like
in stdenv-updates.
vimprobable2: updating to 1.2.0
nm-applet: Update to 0.9.6.4
nix: Update to 1.4pre3048_99ed558
procps-ng: Add

This will replace procps eventually.
taskcoach: updating to 1.3.22