diff -r 3d77ea1625ff net/lwip_tcpip/current/cdl/lwip_net.cdl
--- a/net/lwip_tcpip/current/cdl/lwip_net.cdl	Thu Aug 27 12:54:28 2009 +0300
+++ b/net/lwip_tcpip/current/cdl/lwip_net.cdl	Thu Aug 27 16:42:43 2009 +0300
@@ -81,11 +81,9 @@
                     ecos/ppp.c                  \
                     ecos/sequential.c           \
                     ecos/simple.c               \
-                    ecos/sio.c                  \
                     ecos/sys_arch.c             \
                     netif/etharp.c              \
-                    netif/loopif.c              \
-                    netif/slipif.c
+                    netif/loopif.c
 
     cdl_option CYGIMP_LWIP_MODE {
         display         "Operation mode"
@@ -994,6 +992,9 @@
             default_value   0
             description     "
                 Support SLIP functionality."
+
+            compile ecos/slip.c  netif/slipif.c
+
                 
             cdl_option CYGDAT_LWIP_SLIPIF_DEV {
                 display         "Serial device"