+--- a/arch/um/Makefile-i386
++++ b/arch/um/Makefile-i386
+@@ -39,4 +39,8 @@ KBUILD_CFLAGS += $(shell if [ $(call cc-
+ echo $(call cc-option,-fno-unit-at-a-time); \
+ else echo $(call cc-option,-funit-at-a-time); fi ;)
+
++# disable compile-time buffer checks, enabled by default on Ubuntu 8.10
++# and later
++KBUILD_CFLAGS += $(call cc-option,-U_FORTIFY_SOURCE)
++
+ KBUILD_CFLAGS += $(cflags-y)
+--- a/arch/um/Makefile-x86_64
++++ b/arch/um/Makefile-x86_64
+@@ -24,3 +24,7 @@ LINK-y += -m64
+
+ # Do unit-at-a-time unconditionally on x86_64, following the host
+ KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
++
++# disable compile-time buffer checks, enabled by default on Ubuntu 8.10
++# and later
++KBUILD_CFLAGS += $(call cc-option,-U_FORTIFY_SOURCE)