slight makefile tweaks

GNUmakefile

@@ -72,6 +72,7 @@ clean-cabal:
 	-rm -f Distribution/*.o Distribution/*.hi
 	-rm -f Distribution/Simple/*.o Distribution/Simple/*.hi
 	-rm -f Compat/*.o Compat/*.hi
+	-rm -f darcs* out.build *~ semantic.cache* x*.html
 	-rm -f library-infrastructure--darcs.tar.gz
 	-rm -rf setup *.o *.hi moduleTest dist installed-pkg-config
 	-rm -f build-stamp

TODO

@@ -24,6 +24,9 @@ helpful.
 
 I hope this can sneak into the Cabal release, but don't worry if not.
 
+* add a haskell-version field?
+* ignore unknown fields? (--force?)
+
 -= 1.0 =-
 
 * Install libraries in $libdir/ghc-$ghc_version/ rather than $libdir.