How to mount ext4 partition on OS X 10.8.2?
Instead of installing ext4fuse yourself, try using homebrew to install it. (This is the method recommended by the developer.)
Read the developer's install page here.

Incidentally, if you're from Linux you're probably used to using apt-get to install things. Homebrew describes itself as "The missing package manager for OS X", and makes it a lot easier to install a lot of linux ports. (For example, brew install ext4fuse will install ext4fuse. The advantage of homebrew is that it will automatically download and install dependencies for you.