return value.
(XXX: Except for a pile of allocation macros that produce typed pointer
results; there the typechecking of the result assignment is more valuable
than the warning if the alloc function isn't declared properly. These
macros should go away.)
Use const.
Add __noreturn__ attributes.
Add a __format__ attribute.
Add __unused__ attributes.
Use symbolic constants for open() and lseek().
Declare types of all function parameters; convert some function
definitions to ISO C form.
Ensure standard file descriptors are open on startup.
Check for errors writing output of makedefs.
Avoid duplicate definitions of variables.
