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diff --git a/README.md b/README.md
index 202ad06..b40c9ee 100644
--- a/README.md
+++ b/README.md
@@ -2,9 +2,15 @@ Tracker++ cpp version on Linux (arm)
 
 ## install dependencies
 
+- opencv - 3.4.1
+<https://docs.opencv.org/3.4.1/d7/d9f/tutorial_linux_install.html>
+   Run the script `script/install_opencv.sh`, the prefix is `/usr/local`
+
 - log4cpp : logger utils
-- opencv
 - eigen : matrix library of C++
+- scons
+   `apt-get install liblog4cpp5-dev libeigen3-dev scons`
+   
 - boost-python 
     - `apt-get install libpython-dev python-dev`
     - build boost with python
@@ -12,10 +18,8 @@ Tracker++ cpp version on Linux (arm)
 <https://www.boost.org/doc/libs/1_67_0/libs/python/doc/html/building/installing_boost_python_on_your_.html>
 
 As boost has already 
-
 `sudo ./b2 install link=static cxxflags=-fPIC --with-filesystem --with-test --with-log --with-program_options --with-python`
 
-`apt-get install liblog4cpp5-dev libopencv-dev libeigen3-dev`
 
 ## Build