The SYSLIB data set contains the ISPF library concatenation sequence used to resolve any copy statements specified in your program. It contains the ISPF libraries or other partitioned or sequential data sets and the additional input libraries you specify on the Foreground Assembler H and VS COBOL II Compile panels. For example:

ALLOC FI(SYSLIB) DA('SYS1.MACLIB','proj.lib1.type',...,
       'proj.lib4.type','additional lib1','additional lib2')