--- ./Config.kmk.libcxx	2012-10-26 17:23:13.000000000 +0100
+++ ./Config.kmk	2012-11-24 14:46:31.187664914 +0000
@@ -2587,26 +2587,25 @@ VBOXLNX32GUEST_SUFF_LIB = .a
 # SDKs for external libraries.
 #
 SDK_VBOX_LIBXML2          = .
-SDK_VBOX_LIBXML2_INCS   ?= $(PATH_ROOT)/src/libs/libxml2-2.6.31/include
+SDK_VBOX_LIBXML2_INCS   ?= /usr/include/libxml2
 SDK_VBOX_LIBXML2_DEFS  ?= _REENTRANT
 SDK_VBOX_LIBXML2_DEFS.win += WIN32 _WINDOWS _MBCS
 # note: no linking to LIB here, we do that explicitly in src/VBox/Runtime/Makefile.kmk to link
 # libxml against VBoxRT
 
 SDK_VBOX_LIBPNG       = .
-SDK_VBOX_LIBPNG_INCS ?= $(PATH_ROOT)/src/libs/libpng-1.2.8
+SDK_VBOX_LIBPNG_INCS ?= /usr/include/libpng15
 SDK_VBOX_LIBPNG_LIBS ?= $(PATH_STAGE_LIB)/VBox-libpng$(VBOX_SUFF_LIB)
 
 SDK_VBOX_ZLIB         = .
 if1of ($(KBUILD_TARGET), os2 solaris win)
- SDK_VBOX_ZLIB_INCS  ?= $(PATH_ROOT)/src/libs/zlib-1.2.6
+ SDK_VBOX_ZLIB_INCS  ?= /usr/include/
  SDK_VBOX_ZLIB_LIBS  ?= $(PATH_STAGE_LIB)/VBox-zlib$(VBOX_SUFF_LIB)
 else
  SDK_VBOX_ZLIB_INCS  ?=
  SDK_VBOX_ZLIB_LIBS  ?= z
  SDK_VBOX_ZLIB_DEFS.linux ?= _LARGEFILE64_SOURCE
 endif
-
 SDK_VBOX_OPENSSL      = Only for VBoxRT and/or statically linked programs.
 SDK_VBOX_OPENSSL_VBOX_DEFAULT_INCS := $(PATH_OUT)/obj/crypto-headers/include
 SDK_VBOX_OPENSSL_INCS ?= $(SDK_VBOX_OPENSSL_VBOX_DEFAULT_INCS)