The ISPF client/server (ISPF C/S) feature and the z/OS® UNIX Directory List utility include code are compiled with the IBM® C/C++ compiler. Therefore, the Language Environment® SCEERUN and SCEERUN2 run-time library data sets must be available to this code through either STEPLIB or LNKLIST at execution time. Using the usual ISPLLIB allocation will not make the run-time library available to this code.