When I try to build Yhc, I get this: gcc -o inst/bin/yhi src/runtime/BCKernel/external.o src/runtime/BCKernel/hashtable.o src/runtime/BCKernel/heap.o src/runtime/BCKernel/hsffi.o src/runtime/BCKernel/info.o src/runtime/BCKernel/integer.o src/runtime/BCKernel/iofuncs.o src/runtime/BCKernel/jonkers.o src/runtime/BCKernel/main.o src/runtime/BCKernel/make.o src/runtime/BCKernel/mark.o src/runtime/BCKernel/module.o src/runtime/BCKernel/mutator.o src/runtime/BCKernel/pretty.o src/runtime/BCKernel/primitive.o src/runtime/BCKernel/sanity.o src/runtime/BCKernel/stopcopy.o src/runtime/BCKernel/profile.o src/runtime/BCKernel/foreign.o src/runtime/BCKernel/process.o src/runtime/BCKernel/thread.o src/runtime/BCKernel/stable.o src/runtime/BCKernel/builtin/Concurrent.o src/runtime/BCKernel/builtin/Array.o src/runtime/BCKernel/builtin/FFI.o src/runtime/BCKernel/builtin/IO.o src/runtime/BCKernel/builtin/Prelude.o src/runtime/BCKernel/builtin/PackedString.o src/runtime/BCKernel/builtin/RuntimeAPI.o src/runtime/BCKernel/builtin/System.o depends/ctypes/libffi/src/prep_cif.o depends/ctypes/libffi/src/cfield.o depends/ctypes/libffi/src/x86/ffi.o depends/ctypes/libffi/src/x86/sysv.o -L/usr/local/lib -lgmp -lm -lpthread -ldl YHC_build(["src/packages/yhc-base-1.0/Data/Ix.hbc"], ["src/packages/yhc-base-1.0/Data/Ix.hs"]) inst/bin/yhc -i src/packages/yhc-base-1.0/ -d src/packages/yhc-base-1.0/ -c src/packages/yhc-base-1.0/Data/Ix.hs Compiling Data.Ix ( src/packages/yhc-base-1.0/Data/Ix.hs ) Copy("inst/lib/yhc/packages/yhc-base/1.0/Data/Ix.hi", "src/packages/yhc-base-1.0/Data/Ix.hi") YHC_build(["src/packages/haskell98-1.0/Ix.hbc"], ["src/packages/haskell98-1.0/Ix.hs"]) inst/bin/yhc -i src/packages/haskell98-1.0/ -d src/packages/haskell98-1.0/ -c src/packages/haskell98-1.0/Ix.hs yhc: Error: File not found, Data.Ratio Reason: imported from Ix Looked in: /home/naesten/hacking/haskell/yhc-devel/src/packages/haskell98-1.0/ /home/naesten/hacking/haskell/yhc-devel/inst/lib/yhc/packages/yhc-base/1.0 I can't figure out why Yhc thinks that Ix imports Data.Ratio, because it sure doesn't seem to! The SConscript files for haskell98-1.0 and yhc-base-1.0 are quite bewildering... why is there so much in them anyway? I might like to set up a buildbot, though I don't have much CPU or RAM...