... GPI Data Pipeline 1.0 documentation . ... Frequently Asked Questions . ... When trying to start the pipeline, I get the error ?xterm: Can?t execvp idl: No such file or directory? ... Credits for the GPI Pipeline Software Development . ... You can either (1) change your $PATH to include the directory with idl, (2) put a symlink pointing to idl in some directory already in your path, or (3) edit your local copy of the gpi-pipeline script to explicitly set the full path to the idl executable. ...