diff --git a/src/haricot/cmake/TopLevelCMake.txt b/src/haricot/cmake/TopLevelCMake.txt
index 9d8bfd3..9bf7945 100644
--- a/src/haricot/cmake/TopLevelCMake.txt
+++ b/src/haricot/cmake/TopLevelCMake.txt
@@ -6,7 +6,10 @@ execute_process(COMMAND bash -c ${cmd}
     WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
     RESULT_VARIABLE result
     OUTPUT_VARIABLE ORIGIN)
-
+# By default build shared lib
+if(NOT DEFINED BUILD_SHARED_LIBS)
+	set(BUILD_SHARED_LIBS ON) # by default shared is on and will be set to OFF if we do arm stuff
+endif()
 include(${ORIGIN}/customMacro.cmake)
 include(${ORIGIN}/python.cmake)
 set(ROOT_DIR "${CMAKE_SOURCE_DIR}")
diff --git a/src/haricot/cmake/stm32/stm32l4xx.cmake b/src/haricot/cmake/stm32/stm32l4xx.cmake
new file mode 100644
index 0000000..6aad6f1
--- /dev/null
+++ b/src/haricot/cmake/stm32/stm32l4xx.cmake
@@ -0,0 +1,17 @@
+if (NOT DEFINED ENV{CUBE})
+	message(FATAL_ERROR "CUBE environment variable was not defined!")
+endif()
+
+set(CUBE_HOME "$ENV{CUBE}" CACHE INTERNAL "Copied from environment variable")
+
+SET (CUBE_ROOT "${CUBE_HOME}/Repository/STM32Cube_FW_L4_V1.14.0")
+ 
+SET (LINKER_SCRIPT "${CUBE_ROOT}/Projects/NUCLEO-L476RG/Templates/SW4STM32/STM32L476RG_NUCLEO/STM32L476RGTx_FLASH.ld")
+ 
+SET (CMAKE_SYSTEM_NAME Generic)
+SET (CMAKE_SYSTEM_PROCESSOR arm)
+ 
+
+SET(CMAKE_CXX_FLAGS "-mcpu=cortex-m4 -std=c++11 -fno-rtti -fno-exceptions -Wall -fdata-sections -ffunction-sections -MD -Wall" CACHE INTERNAL "cxx compiler flags")
+ 
+SET (CMAKE_EXE_LINKER_FLAGS "-T ${LINKER_SCRIPT} -specs=nosys.specs -Wl,--gc-sections" CACHE INTERNAL "exe link flags")
diff --git a/src/haricot/haricot b/src/haricot/haricot
index b63a71e..6355d30 100755
--- a/src/haricot/haricot
+++ b/src/haricot/haricot
@@ -1,6 +1,58 @@
+#!/bin/bash
 set -e
 DIR=$(dirname ${0})
+SL_PATH=$( dirname $(realpath ${0}) )
+
+USAGE="$(basename "$0"): Haricot build system
+
+where:
+	clean                -- clean build & install directory
+	-s|--stm32 toolchain -- Cross-compile using the provided toolchain ex: stm32l4
+	-h|--help            -- print this"
+
+function clean_directories {
+	echo "Deleting install directory and build directory content"
+	rm -Rf ${DIR}/install
+	rm -Rf ${DIR}/build/*
+	echo "Cleaned"
+}
+
+function stm32_compiler {
+	CMAKE_COMPILER_ARGS="-DBUILD_SHARED_LIBS:BOOL=OFF -DCMAKE_CXX_COMPILER=arm-none-eabi-g++"	
+	CMAKE_COMPILER_ARGS="${CMAKE_COMPILER_ARGS} -DCMAKE_C_COMPILER=arm-none-eabi-gcc "	
+}
+
+function stm32_toolchain {
+	CMAKE_TOOLCHAIN_ARGS="-DCMAKE_TOOLCHAIN_FILE=${SL_PATH}/cmake/stm32/${STM32_TO_USE}.cmake"
+}
+
+USE_STM32=false
+CMAKE_COMPILER_ARGS=""
+CMAKE_TOOLCHAIN_ARGS=""
+STM32_TO_USE=""
+while [[ $# -gt 0 ]]
+do
+    case "$1" in
+        -s|--stm32)
+        USE_STM32=true
+	STM32_TO_USE=$2
+	stm32_compiler
+	stm32_toolchain
+        shift
+        shift
+        ;;
+        clean)
+	clean_directories	
+	exit 1
+        ;;
+        -h|--help)
+        echo "$USAGE"
+ 	exit 1	
+        ;;
+    esac
+done
+
 cd ${DIR}/build
-cmake -GNinja ..
+cmake ${CMAKE_COMPILER_ARGS} ${CMAKE_TOOLCHAIN_ARGS} -GNinja ..
 ninja
 cd -