what may be wrong here ? ghc -ldl -fglasgow-exts -cpp -Iinclude -funbox-strict-fields -package-name base -O -H24m -keep-hc-files-too -optc-DNO_REGS -optc-DUSE_MINIINTERPRETER -fno-asm-mangling -funregisterised -fvia-C -split-objs -c GHC/Base.lhs -o GHC/Base.o ghc-5.04.2: invalid option combination Usage: For basic information, try the `--help' option.