If the SCEERUN and SCEERUN2 data sets cannot be placed in LNKLST, you can STEPLIB the data sets for each application that requires them. One reason why the Language Environment runtime libraries are not to be placed in LNKLST might be that the pre-Language Environment runtime libraries (VS COBOL II, OS PL/I) are placed in LNKLST and your site has not completed the migration to Language Environment®. See z/OS Language Environment Runtime Application Migration Guide for details.

Applications that currently STEPLIB to the SCEERUN data set to gain access to the runtime library provided by Language Environment, do not need to add the SCEERUN2 data set as part of their STEPLIB concatenation. In fact, since SCEERUN2 contains module names that do not intersect with any pre-Language Environment runtime library or any existing library, IBM® recommends that SCEERUN2 be added to the LNKLST. This will not result in any adverse effects.