The following is an example face two-line file:

2tQjSw>|IA680lA7r'G9Y[jfoS>tTPw4-B#mQo_C+{6>^DWZP`o.h<N!-!iBER@5!"`:9^t

~MyeXP43[]t)W-sTm)TibB_c4=**35T?X(,6,POUlqae[Aq$"zn4hN{{w@(=rYp\i=\wUyhL

Running it as this

uncompface example.face | ikon2xbm > example.xmb

gives an error:

icontopbm: error 4 scanning bits item
pbmtoxbm: EOF / read error reading magic number

The error is ``cured'' by adding a page-width directive of
-w55 to the pr command in ikon2xbm:

*** ikon2xbm.orig       Fri May  1 03:19:12 1998
--- ikon2xbm    Tue Jun 16 19:30:42 1998
***************
*** 28,34 ****

  dim=`wc -l < $tmp | awk '{ print 4 * sqrt($1) }'`

! pr -l1 -t -8 -s, < $tmp |
  (cat << EOF
  /* Format_version=1, Width=$dim, Height=$dim, Depth=1,
Valid_bits_per_item=16
   */
--- 28,34 ----

  dim=`wc -l < $tmp | awk '{ print 4 * sqrt($1) }'`

! pr -w55 -l1 -t -8 -s, < $tmp |
  (cat << EOF
  /* Format_version=1, Width=$dim, Height=$dim, Depth=1,
Valid_bits_per_item=16
   */