+
+# Make sure MACHINE isn't exported
+# (breaks binutils at least)
+MACHINE[unexport] = "1"
+
+# Make sure TARGET_ARCH isn't exported
+# (breaks Makefiles using implicit rules, e.g. quilt, as GNU make has this
+# in them, undocumented)
+TARGET_ARCH[unexport] = "1"
+
+# Make sure DISTRO isn't exported
+# (breaks sysvinit at least)
+DISTRO[unexport] = "1"
+