idlwave-use-library-catalogs

idlwave-use-library-catalogs is a variable defined in `idlwave.el'.
Its value is

t

Documentation:
Non-nil means search the IDL path for library catalog files.

These files, named .idlwave_catalog, document routine information for
individual directories and libraries of IDL .pro files. Many popular
libraries come with catalog files by default, so leaving this on is
usually a good idea.

You can customize this variable.