diff --git a/Makefile b/Makefile
index 6fac1e5..2802bf9 100755
--- a/Makefile
+++ b/Makefile
@@ -1059,7 +1059,7 @@ EXTRA_CFLAGS += -DCONFIG_IOCTL_CFG80211 -DRTW_USE_CFG80211_STA_EVENT
 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/)
 ARCH ?= $(SUBARCH)
 CROSS_COMPILE ?=
-KVER  := $(shell uname -r)
+KVER  ?= $(shell uname -r)
 KSRC := /lib/modules/$(KVER)/build
 MODDESTDIR := /lib/modules/$(KVER)/kernel/drivers/net/wireless/
 INSTALL_PREFIX :=
@@ -1071,7 +1071,7 @@ EXTRA_CFLAGS += -DCONFIG_LITTLE_ENDIAN -DCONFIG_PLATFORM_ANDROID -DCONFIG_PLATFO
 ARCH := $(R_ARCH)
 #CROSS_COMPILE := arm-none-linux-gnueabi-
 CROSS_COMPILE := $(R_CROSS_COMPILE)
-KVER:= 3.4.0
+KVER ?= 3.4.0
 #KSRC := ../../../../build/out/kernel
 KSRC := $(KERNEL_BUILD_PATH)
 MODULE_NAME :=wlan
@@ -1134,10 +1134,10 @@ endif
 
 ifeq ($(CONFIG_PLATFORM_MSTAR_TITANIA12), y)
 EXTRA_CFLAGS += -DCONFIG_LITTLE_ENDIAN -DCONFIG_PLATFORM_MSTAR -DCONFIG_PLATFORM_MSTAR_TITANIA12
-ARCH:=mips
+ARCH :=mips
 CROSS_COMPILE:= /usr/src/Mstar_kernel/mips-4.3/bin/mips-linux-gnu-
-KVER:= 2.6.28.9
-KSRC:= /usr/src/Mstar_kernel/2.6.28.9/
+KVER ?= 2.6.28.9
+KSRC := /usr/src/Mstar_kernel/2.6.28.9/
 endif
 
 ifeq ($(CONFIG_PLATFORM_MSTAR), y)
@@ -1145,10 +1145,10 @@ EXTRA_CFLAGS += -DCONFIG_CONCURRENT_MODE
 EXTRA_CFLAGS += -DCONFIG_IOCTL_CFG80211 -DRTW_USE_CFG80211_STA_EVENT
 EXTRA_CFLAGS += -DCONFIG_LITTLE_ENDIAN -DCONFIG_PLATFORM_MSTAR -DCONFIG_USE_USB_BUFFER_ALLOC_TX -DCONFIG_FIX_NR_BULKIN_BUFFER -DCONFIG_PREALLOC_RX_SKB_BUFFER
 EXTRA_CFLAGS += -DCONFIG_PLATFORM_MSTAR_HIGH
-ARCH:=arm
+ARCH :=arm
 CROSS_COMPILE:= /usr/src/bin/arm-none-linux-gnueabi-
-KVER:= 3.1.10
-KSRC:= /usr/src/Mstar_kernel/3.1.10/
+KVER ?= 3.1.10
+KSRC := /usr/src/Mstar_kernel/3.1.10/
 endif
 
 ifeq ($(CONFIG_PLATFORM_ANDROID_X86), y)
@@ -1187,7 +1187,7 @@ ifeq ($(CONFIG_PLATFORM_ARM_PXA2XX), y)
 EXTRA_CFLAGS += -DCONFIG_LITTLE_ENDIAN
 ARCH := arm
 CROSS_COMPILE := arm-none-linux-gnueabi-
-KVER  := 2.6.34.1
+KVER  ?= 2.6.34.1
 KSRC ?= /usr/src/linux-2.6.34.1
 endif
 
@@ -1195,7 +1195,7 @@ ifeq ($(CONFIG_PLATFORM_ARM_S3C2K4), y)
 EXTRA_CFLAGS += -DCONFIG_LITTLE_ENDIAN
 ARCH := arm
 CROSS_COMPILE := arm-linux-
-KVER  := 2.6.24.7_$(ARCH)
+KVER  ?= 2.6.24.7_$(ARCH)
 KSRC := /usr/src/kernels/linux-$(KVER)
 endif
 
@@ -1203,40 +1203,40 @@ ifeq ($(CONFIG_PLATFORM_ARM_S3C6K4), y)
 EXTRA_CFLAGS += -DCONFIG_LITTLE_ENDIAN
 ARCH := arm
 CROSS_COMPILE := arm-none-linux-gnueabi-
-KVER  := 2.6.34.1
+KVER  ?= 2.6.34.1
 KSRC ?= /usr/src/linux-2.6.34.1
 endif
 
 ifeq ($(CONFIG_PLATFORM_RTD2880B), y)
 EXTRA_CFLAGS += -DCONFIG_BIG_ENDIAN -DCONFIG_PLATFORM_RTD2880B
-ARCH:=
+ARCH :=
 CROSS_COMPILE:=
-KVER:=
-KSRC:=
+KVER ?=
+KSRC :=
 endif
 
 ifeq ($(CONFIG_PLATFORM_MIPS_RMI), y)
 EXTRA_CFLAGS += -DCONFIG_LITTLE_ENDIAN
-ARCH:=mips
+ARCH :=mips
 CROSS_COMPILE:=mipsisa32r2-uclibc-
-KVER:=
-KSRC:= /root/work/kernel_realtek
+KVER ?=
+KSRC := /root/work/kernel_realtek
 endif
 
 ifeq ($(CONFIG_PLATFORM_MIPS_PLM), y)
 EXTRA_CFLAGS += -DCONFIG_BIG_ENDIAN
-ARCH:=mips
+ARCH :=mips
 CROSS_COMPILE:=mipsisa32r2-uclibc-
-KVER:=
-KSRC:= /root/work/kernel_realtek
+KVER ?=
+KSRC := /root/work/kernel_realtek
 endif
 
 ifeq ($(CONFIG_PLATFORM_MSTAR389), y)
 EXTRA_CFLAGS += -DCONFIG_LITTLE_ENDIAN -DCONFIG_PLATFORM_MSTAR389
-ARCH:=mips
+ARCH :=mips
 CROSS_COMPILE:= mips-linux-gnu-
-KVER:= 2.6.28.10
-KSRC:= /home/mstar/mstar_linux/2.6.28.9/
+KVER ?= 2.6.28.10
+KSRC := /home/mstar/mstar_linux/2.6.28.9/
 endif
 
 ifeq ($(CONFIG_PLATFORM_MIPS_AR9132), y)
@@ -1260,25 +1260,25 @@ EXTRA_CFLAGS += -DCONFIG_PLATFORM_OPS
 ifeq ($(CONFIG_USB_HCI), y)
 _PLATFORM_FILES += platform/platform_RTK_DMP_usb.o
 endif
-ARCH:=mips
-CROSS_COMPILE:=mipsel-linux-
-KVER:=
+ARCH :=mips
+CROSS_COMPILE :=mipsel-linux-
+KVER ?=
 KSRC ?= /usr/src/DMP_Kernel/jupiter/linux-2.6.12
 endif
 
 ifeq ($(CONFIG_PLATFORM_MT53XX), y)
 EXTRA_CFLAGS += -DCONFIG_LITTLE_ENDIAN -DCONFIG_PLATFORM_MT53XX
-ARCH:= arm
+ARCH := arm
 CROSS_COMPILE:= arm11_mtk_le-
-KVER:= 2.6.27
-KSRC?= /proj/mtk00802/BD_Compare/BDP/Dev/BDP_V301/BDP_Linux/linux-2.6.27
+KVER ?= 2.6.27
+KSRC ?= /proj/mtk00802/BD_Compare/BDP/Dev/BDP_V301/BDP_Linux/linux-2.6.27
 endif
 
 ifeq ($(CONFIG_PLATFORM_ARM_MX51_241H), y)
 EXTRA_CFLAGS += -DCONFIG_LITTLE_ENDIAN -DCONFIG_WISTRON_PLATFORM
 ARCH := arm
 CROSS_COMPILE := /opt/freescale/usr/local/gcc-4.1.2-glibc-2.5-nptl-3/arm-none-linux-gnueabi/bin/arm-none-linux-gnueabi-
-KVER  := 2.6.31
+KVER ?= 2.6.31
 KSRC ?= /lib/modules/2.6.31-770-g0e46b52/source
 endif
 
@@ -1293,7 +1293,7 @@ ifeq ($(CONFIG_PLATFORM_ACTIONS_ATJ227X), y)
 EXTRA_CFLAGS += -DCONFIG_LITTLE_ENDIAN -DCONFIG_PLATFORM_ACTIONS_ATJ227X
 ARCH := mips
 CROSS_COMPILE := /home/cnsd4/project/actions/tools-2.6.27/bin/mipsel-linux-gnu-
-KVER  := 2.6.27
+KVER  ?= 2.6.27
 KSRC := /home/cnsd4/project/actions/linux-2.6.27.28
 endif
 
@@ -1307,14 +1307,14 @@ ARCH := arm
 CROSS_COMPILE := /opt/montavista/pro5.0/devkit/arm/v5t_le/bin/arm-linux-
 KSRC:= /home/vivotek/lsp/DM365/kernel_platform/kernel/linux-2.6.18
 KERNELOUTPUT := ${PRODUCTDIR}/tmp
-KVER  := 2.6.18
+KVER  ?= 2.6.18
 endif
 
 ifeq ($(CONFIG_PLATFORM_MOZART), y)
 EXTRA_CFLAGS += -DCONFIG_LITTLE_ENDIAN -DCONFIG_PLATFORM_MOZART
 ARCH := arm
 CROSS_COMPILE := /home/vivotek/lsp/mozart3v2/Mozart3e_Toolchain/build_arm_nofpu/usr/bin/arm-linux-
-KVER  := $(shell uname -r)
+KVER  ?= $(shell uname -r)
 KSRC:= /opt/Vivotek/lsp/mozart3v2/kernel_platform/kernel/mozart_kernel-1.17
 KERNELOUTPUT := /home/pink/sample/ODM/IP8136W-VINT/tmp/kernel
 endif
@@ -1439,8 +1439,8 @@ ifeq ($(CONFIG_PLATFORM_SZEBOOK), y)
 EXTRA_CFLAGS += -DCONFIG_BIG_ENDIAN
 ARCH:=arm
 CROSS_COMPILE:=/opt/crosstool2/bin/armeb-unknown-linux-gnueabi-
-KVER:= 2.6.31.6
-KSRC:= ../code/linux-2.6.31.6-2020/
+KVER ?= 2.6.31.6
+KSRC := ../code/linux-2.6.31.6-2020/
 endif
 
 #Add setting for MN10300
@@ -1448,7 +1448,7 @@ ifeq ($(CONFIG_PLATFORM_MN10300), y)
 EXTRA_CFLAGS += -DCONFIG_LITTLE_ENDIAN -DCONFIG_PLATFORM_MN10300
 ARCH := mn10300
 CROSS_COMPILE := mn10300-linux-
-KVER := 2.6.32.2
+KVER ?= 2.6.32.2
 KSRC := /home/winuser/work/Plat_sLD2T_V3010/usr/src/linux-2.6.32.2
 INSTALL_PREFIX :=
 endif
@@ -1474,7 +1474,7 @@ endif
 ARCH := arm
 #CROSS_COMPILE := arm-none-linux-gnueabi-
 CROSS_COMPILE=/home/android_sdk/Allwinner/a10/android-jb42/lichee-jb42/buildroot/output/external-toolchain/bin/arm-none-linux-gnueabi-
-KVER  := 3.0.8
+KVER  ?= 3.0.8
 #KSRC:= ../lichee/linux-3.0/
 KSRC=/home/android_sdk/Allwinner/a10/android-jb42/lichee-jb42/linux-3.0
 endif
@@ -1760,7 +1760,7 @@ EXTRA_CFLAGS += -DCONFIG_USE_USB_BUFFER_ALLOC_RX
 EXTRA_CFLAGS += -DCONFIG_USE_USB_BUFFER_ALLOC_TX
 ARCH ?= arm
 CROSS_COMPILE := arm-linux-gnueabihf-
-KVER := 3.8.0
+KVER ?= 3.8.0
 KSRC := /Custom/Novatek/TCL/linux-3.8_header
 #KSRC := $(KERNELDIR)
 endif