5 5 55  C-compiler
  It allows to change the list of auxiliary libraries
which are passed to  the linker. For instance, it could
be the libraries which support the work of model. Other
example is the attaching CERN PDFLIB to the code.
In this case you have to add a record  like 
   -L/cern/pro/lib -lpdflib804 -lmathlib -lpacklib  
  Your improvements will be saved on the disk. 
