我首先安装了scons.zip，然后执行了“python setup.py install --user”命令来安装scons，它说，
Installed SCons library modules into
/Users/jacklee/Library/Python/2.7/lib/scons-3.0.1
Installed SCons scripts into /Users/jacklee/Library/Python/2.7/bin
Installed SCons man pages into /Users/jacklee/Library/Python/2.7/man/man1
但是当我尝试运行时
scons configure
它不起作用并且说，
scons: command not found
我在这里做错了什么