npm安装spm出错，请问是什么问题

npm安装spm出错，请问是什么问题

npm install spm -g npm http GET https://registry.npmjs.org/spm npm
http 200 https://registry.npmjs.org/spm npm http GET
https://registry.npmjs.org/spm/-/spm-0.4.1.tgz npm http 200
https://registry.npmjs.org/spm/-/spm-0.4.1.tgz
npm ERR! Error: EACCES, mkdir ‘/usr/local/lib/node_modules/spm’ npm
ERR! npm ERR! Please try running this command again as
root/Administrator. npm ERR! npm ERR! System Darwin 12.2.0 npm ERR!
command “node” “/usr/local/bin/npm” “install” “spm” “-g” npm ERR! cwd
/Users/nameng npm ERR! node -v v0.6.15 npm ERR! npm -v 1.1.16 npm ERR!
path /usr/local/lib/node_modules/spm npm ERR! fstream_path
/usr/local/lib/node_modules/spm npm ERR! fstream_type Directory npm
ERR! fstream_class DirWriter npm ERR! code EACCES npm ERR! message
EACCES, mkdir ‘/usr/local/lib/node_modules/spm’ npm ERR! errno {} npm
ERR! fstream_stack
/usr/local/lib/node_modules/npm/node_modules/fstream/lib/dir-writer.js:36:23
npm ERR! fstream_stack Object.oncomplete
(/usr/local/lib/node_modules/npm/node_modules/mkdirp/index.js:42:17)
npm ERR! npm ERR! Additional logging details can be found in: npm
ERR! /Users/nameng/npm-debug.log npm not ok
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