The GNU portability library is a macro system and C declarations and definitions for commonly-used API
elements and abstracted system behaviors. It can be used to improve portability and other functionality
in your programs.
check-module reads a module description file and derives the set of files included directly by any .c or
.h file listed in the `Files:' section. First, it takes the union of all such sets for any dependent
modules. Then, it compares that set with the set derived from the names listed in the various Files:
sections.