Several files in uucp/libunix included <sys/dir.h> and defined dirent
as direct, but <sys/dir.h> defines direct as dirent. This macro
recursion is not allowed by cpp in traditional mode. The 2.0 mkdep
uses cpp in traditional mode (another bug) so cpp prints a error
message and exits with a nonzero status. The error status leaks out
of the pipe (another bug) so mkdep "succeeds". It may even succeed.
saying that 4.4 uses f_size in statfs, yet we're using b_size. Anyway,
I've configured things to match our current environment.
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