>>> Merging sys-boot/grub-0.97-r3 to /
 * 
 * To avoid automounting and autoinstalling with /boot,
 * just export the DONT_MOUNT_BOOT variable.
 * 
 * 
 * Your boot partition was detected as being mounted as /boot.
 * Files will be installed there for grub to function correctly.
 * 
--- /bin/
>>> /bin/mbchk
--- /boot/
Traceback (most recent call last):
  File "/usr/bin/emerge", line 5760, in ?
    retval = emerge_main()
  File "/usr/bin/emerge", line 5753, in emerge_main
    myopts, myaction, myfiles, spinner)
  File "/usr/bin/emerge", line 5215, in action_build
    retval = mergetask.merge(pkglist, favorites, mtimedb)
  File "/usr/bin/emerge", line 3341, in merge
    prev_mtimes=ldpath_mtimes)
  File "/usr/lib/portage/pym/portage.py", line 3901, in doebuild
    vartree=vartree, prev_mtimes=prev_mtimes)
  File "/usr/lib/portage/pym/portage.py", line 4090, in merge
    mydbapi=mydbapi, prev_mtimes=prev_mtimes)
  File "/usr/lib/portage/pym/portage.py", line 8061, in merge
    cleanup=cleanup, mydbapi=mydbapi, prev_mtimes=prev_mtimes)
  File "/usr/lib/portage/pym/portage.py", line 7704, in treewalk
    if self.mergeme(srcroot,destroot,outfile,secondhand,"",cfgfiledict,mymtime):
  File "/usr/lib/portage/pym/portage.py", line 7977, in mergeme
    join(offset, x), cfgfiledict, thismtime):
  File "/usr/lib/portage/pym/portage.py", line 7970, in mergeme
    os.mkdir(mydest)
OSError: [Errno 5] Input/output error: '/boot/grub'