Calculating dependencies  ..... ....... done!

>>> Emerging (1 of 1) sys-fs/fuse-2.6.3 to /
[..] 
 * Removing sys-fs/fuse-2.6.3 from moduledb.
>>> Original instance of package unmerged safely.
 * Updating module dependencies for 2.6.20-gentoo-r6 ...
 * 
 * /usr/src/linux/System.map not found.
 * You must manually update the kernel module dependencies using depmod.
  [ !! ]
 * 
 * Adding module to moduledb.
>>> sys-fs/fuse-2.6.3 merged.

# depmod
# modprobe fuse
FATAL: Module fuse not found.