求助：烦请各位指点一下，nodejs 原码安装安装时提示：IOError: [Errno 13] Permission denied: '/usr/local/bin/node' ，先谢过！

环境：ubuntu 12.10 node版本：v0.10.5 错误详情：
make[1]: Leaving directory `/home/sammo/soft/node-v0.10.5/out' ln -fs out/Release/node node /usr/bin/python tools/install.py install installing /usr/local/bin/node Traceback (most recent call last): File "tools/install.py", line 156, in run(sys.argv[:]) File "tools/install.py", line 151, in run if cmd == 'install': return files(install) File "tools/install.py", line 122, in files action(['out/Release/node'], 'bin/node') File "tools/install.py", line 79, in install def install(paths, dst): map(lambda path: try_copy(path, dst), paths) File "tools/install.py", line 79, in def install(paths, dst): map(lambda path: try_copy(path, dst), paths) File "tools/install.py", line 71, in try_copy return shutil.copy2(source_path, target_path) File "/usr/lib/python2.7/shutil.py", line 130, in copy2 copyfile(src, dst) File "/usr/lib/python2.7/shutil.py", line 83, in copyfile with open(dst, 'wb') as fdst: IOError: [Errno 13] Permission denied: '/usr/local/bin/node' make: *** [install] Error 1