/usr/include/freebsd/ctype.h is in freebsd-glue 0.2.22.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #include_next <ctype.h>
#ifndef _CTYPE_H_
#define _CTYPE_H_
#ifndef isnumber
#define isnumber(x) isdigit(x)
#endif
#endif /* !_CTYPE_H_ */
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