I understand that egcs produced better code than gcc for x86
at one time, but this was never true for all architectures
(example: gcc and egcs for ARM were always identical).
Since egcs has been merged back into gcc, more and more of
these special cased spec files are gonna be causing
headaches in the future as well.

The "CC=egcs" force is done a patch (uggh).  A possibly
better approach would be to do the following in the spec
file:

  if [ -e `type -p egcs` ] ; then \
    make CC=egcs ; \
  else \
    make ; \
  fi