Hi Andrew > src/packages/yhc-base-1.0/ -c src\packages\yhc-base-1.0\Foreign\Word.hs > yhc.exe: Unknown preprocessor directive at line 16 in file > "D:\\programming\\yhc-devel/src\\packages\\yhc-base-1.0\\Foreign\\Word.hs" > define WORD_TYPE(T,BS,LB,UB) \ Specifying -cpp at the Yhc command line should fix this one. Thanks Neil