tabs turned into space when going into Org Src...?

[Greg Minshall]

hi.  it seems going into Org Src, at least from a "makefile" source
block, changes the tabs (the the base org mode added for me) into
spaces, and leaves them as spaces when i merge back into the main .org
file (and, so, make(1) complains, "missing separator").

is this intentional?

#+begin_src makefile
  all:
        echo all done
#+end_src

note that the first character of the "echo" line is a <TAB> (or, was,
when i composed this message, sigh).  do a C-', and note that in the Org
Src buffer, the "echo" line will start with a string of spaces.

cheers, Greg

ps -- is there some way i should escape/mime'ify such source blocks in
e-mail (to this list, at least)?