ftp.nice.ch/pub/next/unix/developer/plplot.3.0.s.tar.gz#/plplot/src/plclr.c

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#include "plplot.h"

void plclr()
{
   int level;
   glev(&level);
   if (level < 1)
      plexit("Please call plstar before calling plclr.");

   grclr();
}

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