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--- 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)
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