[okl4-developer] build error UserList missing

[ANPING WANG]

sorry i have some problem when building the OKL4 1.5.2

$:~/okl4_release_1.5.2$ tools/build.py machine=ia32_pc99 project=iguana
 Traceback (most recent call last):
  File "tools/build.py", line 80, in ?
    import SCons.Script
  File "tools/SCons/Script/__init__.py", line 45, in ?
    import UserList
ImportError: No module named UserList
$:~/okl4_release_1.5.2$

is there anything i can do to solve this problem??
thanks
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