Now that pkgsrc has a powerful emulation handling infrastructure
I'd like to know if it is possible to have different emulation roots
installed in parallel (for a given emulation, e.g. linux) and select
the emulation root for running a foreign binary at runtime, e.g.
having

  /emul/suse9
  /emul/suse10
  /emul/debian-sarge
  /emul/debian-etch
  ...

and let the emulation root be specified at runtime, e.g. by an
enivronment variable (LINUX_EMUL_ROOT?). From looking
at the sources, this does not seem to be possible, but I might
have overlooked it.

Would be easy to add such a functionality or is the fixed emulation root
 hardwired in many places?

Joachim