Description of problem:
Read into mutt a folder with messages containing
a  multipart/mixed{ multipart/alternative{ text/plain, text/html },
                    application/anything }
Attempting to "view" the message structure with "v" command results
SEGV in  addch()  call, which lengthy debugging session did show up
to be  slang-library  function  SLcurses_waddch()  via couple macro
redirects.

This appeared after I had updated kernel, glibc, lots of other
libraries, and had restarted the system.  I hadn't updated either
mutt, nor slang at that point.  After updating both, the problem
didn't disappear.

Recompining the mutt with slang removed from its SPEC file, the mutt
with standard ncurses (-5 ?) does work just fine.

Version-Release number of selected component (if applicable):
slang-1.4.5-17

How reproducible:
Always

Steps to Reproduce:
1. have suitably complex structured message in a test folder
   (e.g. text+html type accompanying letter + any attachment)
2. current rawhide system
3. mutt -f test.msg
4. try to view ("v") message's structure
    

Actual Results:  SEGV

Expected Results:  view of the message structure..

Additional info:

Is this related somehow to glibc locale handling ? (maybe)
Or to slang-library bitrot ?  (hardly)
Or to a new  2.4.20-20.1.2007.nptl  kernel ?  (hardly)

Ah, indeed..

  LC_CTYPE=C        -> no problem
  LC_CTYPE=fi_FI    -> SEGV

I need "non-C" locale, so this isn't an easy work-around..

Anyway, slang-source version is a bit oldish, and could
be updated.