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-rw-r--r--config/x86_32.mk2
-rw-r--r--config/x86_64.mk2
-rw-r--r--tools/Rules.mk4
3 files changed, 4 insertions, 4 deletions
diff --git a/config/x86_32.mk b/config/x86_32.mk
index 1f5cd6097d..df52bd6d3e 100644
--- a/config/x86_32.mk
+++ b/config/x86_32.mk
@@ -5,7 +5,7 @@ CONFIG_X86_$(XEN_OS) := y
CONFIG_HVM := y
CONFIG_MIGRATE := y
CONFIG_XCUTILS := y
-CONFIG_IOEMU := y
+CONFIG_IOEMU ?= y
CFLAGS += -m32 -march=i686
diff --git a/config/x86_64.mk b/config/x86_64.mk
index 7bead5c455..4ec6cc196b 100644
--- a/config/x86_64.mk
+++ b/config/x86_64.mk
@@ -6,7 +6,7 @@ CONFIG_COMPAT := y
CONFIG_HVM := y
CONFIG_MIGRATE := y
CONFIG_XCUTILS := y
-CONFIG_IOEMU := y
+CONFIG_IOEMU ?= y
CFLAGS += -m64
diff --git a/tools/Rules.mk b/tools/Rules.mk
index 2dd8ed3913..f4e84c1b77 100644
--- a/tools/Rules.mk
+++ b/tools/Rules.mk
@@ -40,9 +40,9 @@ LDLIBS_libxenvchan = $(SHLIB_libxenctrl) $(SHLIB_libxenstore) -L$(XEN_LIBVCHAN)
SHLIB_libxenvchan = -Wl,-rpath-link=$(XEN_LIBVCHAN)
ifeq ($(CONFIG_Linux),y)
-LIBXL_BLKTAP = y
+LIBXL_BLKTAP ?= y
else
-LIBXL_BLKTAP = n
+LIBXL_BLKTAP ?= n
endif
ifeq ($(LIBXL_BLKTAP),y)