diff --git a/src/drivers/Makefile.raspbian b/src/drivers/Makefile.raspbian
index c97eeda..2222e8d 100644
--- a/src/drivers/Makefile.raspbian
+++ b/src/drivers/Makefile.raspbian
@@ -1,16 +1,12 @@
 MODULE:= rtmouse
-TARGET:= $(MODULE).ko
-
-all: $(TARGET)
-
-$(TARGET): $(MODULE).c
-	make -C /usr/src/linux M=$(PWD) modules
-
 obj-m:= $(MODULE).o
+clean-files:= *.o *.ko *.mod.[co] *~
+
+LINUX_SRC_DIR:=/usr/src/linux
+VERBOSE:=0
 
-install:
-	insmod $(MODULE).ko
+rtmouse.ko: rtmouse.c
+	make -C $(LINUX_SRC_DIR) M=$(shell pwd) V=$(VERBOSE) modules
 
 clean:
-	rm -f *.o *.order *.mod.c *.symvers *.ko
-	rm -rf .*.cmd .tmp_versions
+	make -C $(LINUX_SRC_DIR) M=$(shell pwd) V=$(VERBOSE) clean
\ No newline at end of file
diff --git a/src/drivers/Makefile.ubuntu14 b/src/drivers/Makefile.ubuntu14
index 815b1d6..7844404 100644
--- a/src/drivers/Makefile.ubuntu14
+++ b/src/drivers/Makefile.ubuntu14
@@ -1,15 +1,15 @@
-#Reference: http://www.devdrv.co.jp/linux/kernel26-makefile.htm
-TARGET:= rtmouse.ko
+MODULE:= rtmouse
+obj-m:= $(MODULE).o
+clean-files:= *.o *.ko *.mod.[co] *~
 
-all: ${TARGET}
+LINUX_SRC_DIR:=/usr/src/linux-headers-$(shell uname -r)
+VERBOSE:=0
 
 rtmouse.ko: rtmouse.c
-	make -C /usr/src/linux-headers-`uname -r` M=`pwd` V=1 modules
+	make -C $(LINUX_SRC_DIR) M=$(shell pwd) V=$(VERBOSE) modules
 
 clean:
-	make -C /usr/src/linux-headers-`uname -r` M=`pwd` V=1 clean
-
-obj-m:= rtmouse.o
+	make -C $(LINUX_SRC_DIR) M=$(shell pwd) V=$(VERBOSE) clean
 
 install: rtmouse.ko
 	cp ../../50-rtmouse.rules /etc/udev/rules.d/
@@ -17,4 +17,4 @@ install: rtmouse.ko
 uninstall:
 	rm /etc/udev/rules.d/50-rtmouse.rules
 
-clean-files := *.o *.ko *.mod.[co] *~
+#Reference: http://www.devdrv.co.jp/linux/kernel26-makefile.htm
\ No newline at end of file
diff --git a/utils/build_install.bash b/utils/build_install.bash
index 2c2a4d9..03225cb 100755
--- a/utils/build_install.bash
+++ b/utils/build_install.bash
@@ -1,12 +1,19 @@
 #!/usr/bin/env bash
+set -eu
 
 SRC_DIR=$(cd $(dirname ${BASH_SOURCE:-$0})/../; pwd)
 
 if [ -e /usr/src/linux ]; then
+	# Raspbian/Raspberry Pi OS
 	$SRC_DIR/utils/build_install.raspbian.bash && exit 0
 elif [ "$(ls /usr/src/linux-* 2> /dev/null)" != '' ]; then
-	$SRC_DIR/utils/build_install.ubuntu14.bash && exit 0
+	# Ubuntu
+	if grep -q "Raspberry Pi 4" /proc/cpuinfo; then
+		$SRC_DIR/utils/build_install.raspi4ubuntu.bash && exit 0
+	else
+		$SRC_DIR/utils/build_install.ubuntu14.bash && exit 0
+	fi
 else
+	# Error
 	bash -e $SRC_DIR/utils/print_env.bash "No kernel header files found."
 fi
-
diff --git a/utils/build_install.raspbian.bash b/utils/build_install.raspbian.bash
index 504387c..19e4c99 100755
--- a/utils/build_install.raspbian.bash
+++ b/utils/build_install.raspbian.bash
@@ -1,13 +1,19 @@
-#!/bin/bash -vxe
+#!/bin/bash -eu
 
-dir=$(dirname $0)/../
-[ ! -e /usr/src/linux ] && { bash -e $dir/utils/print_env.bash "No kernel header files found."; exit 1; }
-cd $dir/src/drivers/
+SRC_DIR=$(cd $(dirname ${BASH_SOURCE:-$0})/../; pwd)
+
+# check kernel headers
+[ ! -e /usr/src/linux ] && { bash -e $SRC_DIR/utils/print_env.bash "No kernel header files found."; exit 1; }
+
+# build and install the driver
+cd $SRC_DIR/src/drivers/
 rm Makefile
 ln -s Makefile.raspbian Makefile
 make clean
 make 
 sudo insmod rtmouse.ko
+
+# initialize the driver
 sleep 1
 sudo chmod 666 /dev/rt*
 echo 0 > /dev/rtmotoren0
diff --git a/utils/build_install.raspi4ubuntu.bash b/utils/build_install.raspi4ubuntu.bash
new file mode 100755
index 0000000..0f52a9e
--- /dev/null
+++ b/utils/build_install.raspi4ubuntu.bash
@@ -0,0 +1,21 @@
+#!/bin/bash -eu
+
+SRC_DIR=$(cd $(dirname ${BASH_SOURCE:-$0})/../; pwd)
+
+# check kernel headers
+[ ! -e /usr/src/linux-headers-$(uname -r) ] && { bash -e $SRC_DIR/utils/print_env.bash "No kernel header files found."; exit 1; }
+
+# build and install the driver
+cd $SRC_DIR/src/drivers/
+rm Makefile
+ln -s Makefile.ubuntu14 Makefile
+make clean
+# Update for Raspberry Pi 4
+sed -i -e "s/#define RASPBERRYPI 2/#define RASPBERRYPI 4/g" rtmouse.c
+make
+sudo insmod rtmouse.ko
+
+# initialize the driver
+sleep 1
+sudo chmod 666 /dev/rt*
+echo 0 > /dev/rtmotoren0
diff --git a/utils/build_install.ubuntu14.bash b/utils/build_install.ubuntu14.bash
index 206e209..9087335 100755
--- a/utils/build_install.ubuntu14.bash
+++ b/utils/build_install.ubuntu14.bash
@@ -1,13 +1,19 @@
-#!/bin/bash -vxe
+#!/bin/bash -eu
 
-dir=$(dirname $0)/../
-[ ! -e /usr/src/linux-headers-$(uname -r) ] && { bash -e $dir/utils/print_env.bash "No kernel header files found."; exit 1; }
-cd $dir/src/drivers/
+SRC_DIR=$(cd $(dirname ${BASH_SOURCE:-$0})/../; pwd)
+
+# check kernel headers
+[ ! -e /usr/src/linux-headers-$(uname -r) ] && { bash -e $SRC_DIR/utils/print_env.bash "No kernel header files found."; exit 1; }
+
+# build and install the driver
+cd $SRC_DIR/src/drivers/
 rm Makefile
 ln -s Makefile.ubuntu14 Makefile
 make clean
 make
 sudo insmod rtmouse.ko
+
+# initialize the driver
 sleep 1
 sudo chmod 666 /dev/rt*
 echo 0 > /dev/rtmotoren0