Well... that's weird, attempted to send this directly to dan, having it
bail due to
'failed: relaying not allowed: danarmak@g.o'
I assume I'm being an idiot and screwing up the address (or local
configuration)...

Either way, you might want to take a look at my implementation of
confcache in 
http://dev.gentoo.org/~ferringb/ebuild-daemon/51-pre20-cvs/

You can use SANDBOX_DEBUG_LOG and SANDBOX_DEBUG instead of modifying the
sandbox- works just the same.  Also, variables changing _will_ cause
configure to bail if they've been cached (cflags fex), so you might want
to either filter those entries (they start with ac_cv_env_), or rewrite
them (I went for rewrite, works although I worry about other cache
entries relying on the vars not changing).
Aside from that, there is also the md5'ing of /proc/cpuinfo- most users,
not an issue, as magnade pointed out, this is a killer for users that
have procs that adjust their frequency (laptops fex) for power saving-
this changes the md5 of /proc/cpuinfo pretty much continually,
invalidating the cache continually.
~brian


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