LMFS requires Fuse version 2.6 or higher, and the Fuse perl module version 0.09 with the included patch applied.
The patch updates the module's fuse syntax from version 2.5 to 2.6, as well as adding support for the 'access' and 'lock' callbacks.  If future versions of the module provide those, the patch will no longer be needed.
To apply the patch, cd to Fuse-0.09 and run 'patch -p0 < /path/to/lmfs/Fuse-0.09-patch-jh'
You should see something like:
patching file Fuse.pm
patching file Fuse.xs
patching file Makefile.PL

Then install by running 'perl Makefile.PL && make && make install'

Before running lmfs, you must also load the fuse kernel module.  'modprobe fuse'

Valid lmfs sources must have a .lmfs directory in the root, which must contain a 'signature' file.
The contents of .lmfs/signature is arbitrary, but must match on all source members.
The first one checked will be treated as authoritative, and any that do no match will not participate in the mirror.
Check syslog for events.

Then cd to your lmfs directory, and run:  ./lmfs.pl /first/source:/second/source /mountpoint

