ftp.nice.ch/pub/next/developer/nextsources/libg++_for_3.2.NIH.ba.tar.gz#/NextDeveloper/Headers/g++/ctype.h

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#include <_G_config.h>
extern "C" {
#include_next <ctype.h>
#ifndef toupper
extern int toupper _G_ARGS((int));
#endif
#ifndef tolower
extern int tolower _G_ARGS((int));
#endif
}

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