# In this particular case, it turned out that -DDEBUG made Cabal
# import HUnit, which might not be installed for the compiler we are
# compiling with (e.g. 6.2.1). Hence the filter-out.
-SRC_HC_OPTS += $(filter-out -D%, $(GhcHcOpts))
+SRC_HC_OPTS += $(filter-out -D%, $(GhcHcOpts) $(GhcStage1HcOpts))
# GHC 6.4 didn't have WCsubst.c, but 6.4.1 did, and we need to know
# this in cbits/unicode.c The patchlevel isn't normally exposed as a