[fix error message when testing for drift
John Meacham <john@repetae.net>**20080208155158] hunk ./configure.ac 7
+
hunk ./configure.ac 18
-AC_PROGRAM_REQUIRE(drift-ghc,drift-ghc,     [  --with-drift-ghc=<drift-ghc>    Specify location of drift-ghc binary.])
+AC_PATH_PROG([DRIFTGHC],[drift-ghc], [])
+if test -z "$DRIFTGHC"; then
+    AC_MSG_ERROR([ DrIFT not found get it from http://repetae.net/computer/haskell/DrIFT/])
+fi
hunk ./configure.ac 26
+AC_SUBST(DRIFTGHC)