Index: /trunk/src/VBox/Devices/Makefile.kmk
===================================================================
--- /trunk/src/VBox/Devices/Makefile.kmk	(revision 19977)
+++ /trunk/src/VBox/Devices/Makefile.kmk	(revision 19978)
@@ -693,4 +693,20 @@
 	Network/slirp/udp.c
 
+VBOX_SLIRP_ALIAS_SOURCES= \
+    Network/slirp/libalias/alias.c \
+    Network/slirp/libalias/alias_db.c \
+    Network/slirp/libalias/alias_mod.c \
+    Network/slirp/libalias/alias_proxy.c \
+    Network/slirp/libalias/alias_util.c
+
+ifdef VBOX_WITH_SLIRP_ALIAS
+VBOX_SLIRP_SOURCES += $(VBOX_SLIRP_ALIAS_SOURCES)
+Drivers_INCS += Network/slirp/libalias
+define def_vbox_slirp_alias_cflags
+  $(file)_DEFS += VBOX_SLIRP_ALIAS
+endef
+$(foreach file,$(VBOX_SLIRP_ALIAS_SOURCES),$(eval $(def_vbox_slirp_alias_cflags)))
+endif
+
 VBOX_WITH_SLIRP_DNS_PROXY=1
 
@@ -709,4 +725,5 @@
   $(file)_DEFS += \
       $(if $(VBOX_WITH_SLIRP_MEMORY_CHECK),RTMEM_WRAP_TO_EF_APIS,) \
+      $(if $(VBOX_WITH_SLIRP_ALIAS),VBOX_WITH_SLIRP_ALIAS,) \
       $(if $(VBOX_WITHOUT_SLIRP_CLIENT_ETHER),VBOX_WITHOUT_SLIRP_CLIENT_ETHER,)	\
       $(if $(VBOX_WITH_DEBUG_NAT_SOCKETS),VBOX_WITH_DEBUG_NAT_SOCKETS,)	\