update on scons script

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@118 bbd45198-f89e-11dd-88c7-29a3b14d5316

src/SConscript

@@ -1,7 +1,10 @@
 Import('env')
+Import('RTT_ROOT')
 
 # The set of source files associated with this SConscript file.
 src_local = Glob('*.c')
 
+env.Append(CPPPATH = [RTT_ROOT + '/include'])
 obj = env.Object(src_local)
+
 Return('obj')