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diff --git a/sys/plio/plcircle.x b/sys/plio/plcircle.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <plset.h>
+include <plio.h>
+include "plcircle.h"
+
+
+# PL_CIRCLE -- Rasterop between a circular region as source, and an existing
+# mask as destination.  It is not necessary for the center of the circle to
+# be inside the mask; if it is outside, the boundary of the circle will be
+# clipped to the boundary of the mask.  This is a 2-dim operator.  If the
+# image dimensionality is greater than two the pl_setplane procedure should
+# be called first to specify the plane to be modified.
+
+procedure pl_circle (pl, x, y, radius, rop)
+
+pointer	pl			#I mask descriptor
+int	x,y			#I center coords of circle
+int	radius			#I radius of circle
+int	rop			#I rasterop
+
+int	y1, y2
+pointer	sp, ufd
+extern	pl_ucircle()
+
+begin
+	call plvalid (pl)
+	call smark (sp)
+	call salloc (ufd, LEN_CIRCLEDES, TY_STRUCT)
+
+	y1 = max ( 1, min (PL_AXLEN(pl,2), y - radius))
+	y2 = max (y1, min (PL_AXLEN(pl,2), y + radius))
+
+	C_PL(ufd) = pl
+	C_XCEN(ufd) = x
+	C_YCEN(ufd) = y
+	C_RADIUS(ufd) = radius
+	C_PV(ufd) = 1
+
+	call pl_regionrop (pl, pl_ucircle, ufd, y1, y2, rop)
+
+	call sfree (sp)
+end