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diff --git a/sys/imio/tf/imgnlx.x b/sys/imio/tf/imgnlx.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<imhdr.h>
+
+# IMGNL -- Get the next line from an image of any dimension or datatype.
+# This is a sequential operator.  The index vector V should be initialized
+# to the first line to be read before the first call.  Each call increments
+# the leftmost subscript by one, until V equals IM_LEN, at which time EOF
+# is returned.
+
+int procedure imgnlx (imdes, lineptr, v)
+
+pointer	imdes
+pointer	lineptr				# on output, points to the pixels
+long	v[IM_MAXDIM]			# loop counter
+int	npix, dtype, imgnln()
+errchk	imgnln
+
+begin
+	npix = imgnln (imdes, lineptr, v, TY_COMPLEX)
+
+	if (npix != EOF) {
+	    dtype = IM_PIXTYPE(imdes)
+	    if (dtype != TY_COMPLEX)
+		call imupkx (Memx[lineptr], Memx[lineptr], npix, dtype)
+	}
+
+	return (npix)
+end