The LIBPREFIX directive has a similar function as the {$EXTENSION } and {$LIBSUFFIX } compiler directives: It sets the prefix of the library. This is by default ’lib’ on unices, and empty on windows. The name is simply prepended to the filename.
Example:
library tl; {$LIBPREFIX 'library'} begin end.
will result in a filename librarytl.so on linux, or librarytl.dll on windows.