project grep extends "template/usr_bin.gpr" is

   for Main use (project'Name);
   for Object_Dir use External ("BUILDROOT") & "/" & project'Name;

   package Linker is
      for Trailing_Switches ("C") use
         bin.Linker'Trailing_Switches("C") & ("-lbz2", "-lfts", "-lz");
   end Linker;

end grep;