z/OS Communications Server: IP CICS Sockets Guide
SC27-3649-00
In the C step (running the C socket compiler) you must concatenate
the SEZACMAC, SEZAINST, and SEZANMAC data sets to the SYSLIB DD.
In the PLKED step you must concatenate the SEZARNT1 data set to
the SYSLIB DD if and only if the program is to be compiled as reentrant
(that is, with the RENT option). Ensure that the system administrator
has performed the actions listed for Program Reentrancy in Restrictions
for Using MVS™ TCP/IP API with z/OS® Unix in z/OS XL C/C++ Programming Guide.
In the LKED step you must concatenate the SEZATCP and SEZACMTX
data sets to the SYSLIB DD.