configure of yi generates error message on AMD 64-bit OpenBSD 4.0

A40:/home/daf/Yi/yi-0.1.0}./configure
checking for ghc... ghc
checking for ghc-pkg... ghc-pkg
checking for hsc2hs... hsc2hs
checking for ghc version... 6.6
checking for value of __GLASGOW_HASKELL__... ghc-6.6: /usr/local/lib/ghc-6.6/HSbase.o: unknown architecture
ghc-6.6: panic! (the 'impossible' happened)
  (GHC version 6.6 for x86_64-unknown-openbsd):
        loadObj: failed

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug