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diff --git a/sys/vops/lz/allnl.x b/sys/vops/lz/allnl.x
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+++ b/sys/vops/lz/allnl.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ALLN -- Compute the natural logarithm of a vector (generic).  If the natural
+# logarithm is undefined (x <= 0) a user supplied function is called to get
+# the pixel value to be returned.
+
+procedure allnl (a, b, npix, errfcn)
+
+long	a[ARB], b[ARB]
+int	npix, i
+extern	errfcn()
+long	errfcn()
+errchk	errfcn
+
+begin
+	do i = 1, npix {
+		if (a[i] <= 0)
+		    b[i] = errfcn (a[i])
+		else {
+			b[i] = log (double (a[i]))
+		}
+	}
+end