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diff --git a/sys/gio/gks/gqchh.x b/sys/gio/gks/gqchh.x
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+++ b/sys/gio/gks/gqchh.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<gset.h>
+include	"gks.h"
+
+# GQCHH - Inquire character height.
+
+procedure gqchh (ierror, chh)
+
+int	ierror			# Error indicator
+real	chh			# Character height, in world coordinates
+
+real	dx, dy
+real	gstatr()
+include	"gks.com"
+errchk	gstatr, ggscale
+
+begin
+	if (gk_std == NULL) {
+	    # GKS not in proper state; no active workstations
+	    ierror = 7
+	    chh = -1.0
+	    return
+	} else 
+	    ierror = 0
+
+	iferr {
+	    chh = gstatr (gp[gk_std], G_CHARSIZE)
+
+	    # The character height is expressed in NDC units.  It must be 
+	    # converted to world coordinates before returning.
+
+	    call ggscale (gp[gk_std], 0., 0., dx, dy)
+	    chh = chh * dy
+	} then {
+	    ierror = 1
+	    chh = -1.0
+	}
+end