I am having trouble running any of the gridflow exmaples on PD. my gridflow directory is located at /usr/lib/pd/extra/gridflow. I created the .pdrc file in /home I am a newb to this.So how do i add the CPLUS_INCLUDE_PATH for gridflow? also what is LIBRARY_PATH and LD_LIBRARY_PATH and what is this path supposed to be? Sisil.