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

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/* Sets line color */

#include "plplot.h"

void plcol(color)
int color;
{
      int font,col;
      int level;

      glev(&level);
      if (level < 1)  plexit("Please call plstar before calling plcol.");
      if (color < 0)  plexit("Invalid color in plcol.");

      gatt(&font,&col);
      satt(font,color);
      grcol();
}

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