I changed the hmake call to that one you suggested but sadly another error followed up. cd tools; hmake DtdToHaskell -i../lib ghc -i../lib -c -cpp -o DtdToTypeDefPP.o DtdToTypeDefPP.hs DtdToTypeDefPP.hs:94: Ambiguous occurrence `commaList' It could refer to either `commaList', defined at DtdToTypeDefPP.hs:510 or `Pretty.commaList', imported from Pretty at DtdToTypeDefPP.hs:19 DtdToTypeDefPP.hs:117: Ambiguous occurrence `commaList' It could refer to either `commaList', defined at DtdToTypeDefPP.hs:510 or `Pretty.commaList', imported from Pretty at DtdToTypeDefPP.hs:19 Compilation had errors make: *** [DtdToHaskell] Error 1 bash-2.04$