diff --git a/extlibs/cereal/SConscript b/extlibs/cereal/SConscript
index 7f3e1f80f0d..694513180d3 100644
--- a/extlibs/cereal/SConscript
+++ b/extlibs/cereal/SConscript
@@ -18,16 +18,24 @@ cur = src_dir + '/extlibs/cereal/cereal/include'
 
 # check 'cereal' library, if it doesn't exits, ask user to download it
 if not os.path.exists(old) and not os.path.exists(cur):
-	print '''
+	cereal_env = Environment(ENV = os.environ)
+	c = cereal_env.Action(['git clone https://github.com/USCiLab/cereal.git cereal',
+		'cd cereal && git reset --hard 7121e91e6ab8c3e6a6516d9d9c3e6804e6f65245 && git apply ../../../resource/patches/cereal_gcc46.patch',
+		])
+
+	print 'Downloading cereal library ...'
+	if cereal_env.Execute(c):
+		print '''
 *********************************** Error: ************************************
-*  'Cereal' library doesn't exist. please download cereal to extlibs directory*
-* add apply the patch as following:                                           *
+* Please download cereal and apply the patch as following:                    *
 *     $ git clone https://github.com/USCiLab/cereal.git extlibs/cereal/cereal *
 *     $ cd  extlibs/cereal/cereal                                             *
 *     $ git reset --hard 7121e91e6ab8c3e6a6516d9d9c3e6804e6f65245             *
 *     $ git apply ../../../resource/patches/cereal_gcc46.patch                *
 *******************************************************************************
 '''
-	Exit(1)
-else:
-	env.AppendUnique(CPPPATH = [old, cur])
+		Exit(1)
+	else:
+		print 'Download cereal library complete'
+
+env.AppendUnique(CPPPATH = [old, cur])