ftp.nice.ch/pub/next/unix/developer/ShellPanel.2.0.s.tar.gz#/ShellPanel/getopt.h

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extern int getopt(int argc, char **argv, char *optstring);

extern char *optarg;
extern int optind, opterr;

#define optopt argv[optind - 1][1]
#define getarg(c, v) ((optind < c) ? ((optarg = argv[optind++]) ? 0 : EOF) : EOF)

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.