Why can't I access this Ext4 partition using FUSE? I have installed FUSE for OS X. During installation I ticked the "compatibility layer" option. I have rebooted after installation.

I have an external HDD with one NTFS partition and two Ext4 partitions. Operating systems are installed on the partitions.

I am only able to mount the NTFS partition. The Ext4 partitions appear in Disk Utility, but nothing happens when I try to mount them.

What can I do to access them?
Make sure to install the fuse-ext2 package as well. FUSE is just the compatibility layer, it needs filesystem-specific implementations to be useful.