truecrypt

[Neal Becker]

Has anyone looked at truecrypt?  Looks interesting.  I D/L the source, but
it says:

  Note that Linux kernel headers, located in the 'include' directory, are
  not sufficient for compilation of the TrueCrypt kernel module. Fields of
  'dm_dev' structure must be accessed by TrueCrypt but they are defined only
in
  an internal kernel header 'drivers/md/dm.h'. No appropriate accessor
function
  is available. The complete source code of the Linux kernel is required for
  compilation of the kernel module.