I am trying to run a file, which works well on the university system, but I don't know what do I need to do to make it work on my home Ubuntu system. The particular line which makes the error is: import Foreign.C.Types( CFloat ) And the error is: ----------------------------------------------------------- LSystem.hs:130:4: No instance for (ColorComponent CFloat) arising from a use of `color' at LSystem.hs:130:4-26 Possible fix: add an instance declaration for (ColorComponent CFloat) ..... ------------------------------------------------------------- If I write "import Foreign.C.Types" at the Prelude it says nothing. If I write "import Foreign.C.Types( CFloat )" at the Prelude, it says <interactive>:1:0: parse error on input `import' What can it be? Cheers, Zsolt