I'm using "i586" as RPM_ARCH (e.g. because of the
optimizations in glibc2.1). But egcs.spec is missing this
architecture so the compatibility-libraries
(libstdc++2.8/2.7) will not be installed.
This bug affects a lot of other packages too.
Packaging egcs with 1586 optimizations will be dealt with
in a future release.