The JCLLIB statement contains one keyword parameter:
Specifies the names of the libraries to be searched. The maximum number of libraries that may be specified is 15. You can specify private libraries, system procedure libraries, and installation-defined procedure libraries. The system searches the libraries in the order in which you specify them, before it searches any unspecified default system procedure libraries.
Do not specify a library that is a temporary data set (&&dsname), partitioned data set if a member name is included, or relative generation number for a GDG.