Lint uses the label of "library" header to designate those headers over which a programmer has no control (such as compiler headers). By default all
#includes from a foreign directory, or enclosed within < > , are considered "library." This can be modified through the use of the
+libclass option, and further fine-tuned with the
-libh options. You can then use the
-elibsym options to control just those messages being emitted from library headers. Compiler options files distributed with PC-lint usually contain a
-wlib(1) option which limits lint output from library headers to errors only (suppressing warning and informational messages).