The {$LINKLIB name} will link to a library name. This has the effect of passing -lname to the linker.
As an example, consider the following unit:
| 
 unit getlen;
 
 interface
 {$LINKLIB c}
 
 function strlen (P : pchar) : longint;cdecl;
 
 implementation
 
 function strlen (P : pchar) : longint;cdecl;external;
 
 end.
 | 
| ppc386 foo.pp | 
The same effect could be obtained by removing the linklib directive in the above unit, and specify -k-lc on the command-line:
| ppc386 -k-lc foo.pp |