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diff --git a/sys/pmio/pmpolygon.x b/sys/pmio/pmpolygon.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <pmset.h>
+include	<plio.h>
+
+# PM_POLYGON -- Perform a rasterop operation on the area enclosed by a polygon
+# drawn in a 2-dimensional plane of a mask.  If the dimensionality of the mask
+# exceeds 2, the pm_setplane() procedure should be called first to define the
+# plane of the mask to be modified.
+
+procedure pm_polygon (pl, x, y, npts, rop)
+
+pointer	pl			#I mask descriptor
+int	x[npts]			#I polygon x-vertices
+int	y[npts]			#I polygon y-vertices
+int	npts			#I number of points in polygon
+int	rop			#I rasterop defining operation
+
+int	i
+pointer	sp, xp, yp
+errchk	pl_getplane
+include	"pmio.com"
+
+begin
+	if (PM_MAPXY(pl) == YES) {
+	    call smark (sp)
+	    call salloc (xp, npts, TY_INT)
+	    call salloc (yp, npts, TY_INT)
+
+	    call pl_getplane (pl, v1)
+	    do i = 1, npts {
+		v1[1] = x[i];  v1[2] = y[i]
+		call imaplv (PM_REFIM(pl), v1, v2, PM_MAXDIM)
+		Memi[xp+i-1] = v2[1];  Memi[yp+i-1] = v2[2]
+	    }
+
+	    call pl_polygon (pl, Memi[xp], Memi[yp], npts, rop)
+	    call sfree (sp)
+
+	} else
+	    call pl_polygon (pl, x, y, npts, rop)
+end