It is my habit to compile the Setup.hs or Setup.lhs to "setup" with "ghc --make
Setup.hs -o setup".

The "./setup configure ..." is working.

The "./setup build" causes a segmentation fault. This is for every project I
try (including ones with very default Setup.hs contents). The Cabal-1.2.3.0
used is supplied by the binary distribution of ghc 6.8.2

I tried the same thing and got the same result. Could it be a problem with how Cabal itself was built instead of GHC?

So I sadly say there is still no working ghc 6.8.x for powerpc Leopard.

I guess you're right.

Sean