Current installer checks the following two files to detect whether osxfuse is installed:
- /Library/Filesystems/osxfusefs.fs/Support/osxfusefs.kext
- /opt/local/Library/Filesystems/osxfusefs.fs/Support/osxfusefs.kext
These files are not being created by new osxfuse installations which makes installation of xmount impossible.
As a workaround, simply install an older version of osxfuse (2.5.x should work).