Advice sought for GNUgrep

[Mark C. Marsh]

I am having a problem getting GNUgrep to work on my poor system. I have a
Compaq 286 running SCO Xenix 2.3. Any help that can be pointed my way I 
would greatly appreciate. Error description follows:

I have found a suspicous construction in the gnugrep file dfa.h. It states:
----------------------------------------------------------------------
typedef struct
{
  unsigned index:24,		/* Index into the parse array. */
	   constraint:8;	/* Constraint for matching this position. */
} _position;
----------------------------------------------------------------------

Isn't the storage class for unsigned the same as unsigned int, and if this
is so then a total of 32 bits are being assigned to the storage allocated
for this structof ~16 bits. Needless to say, the compiler grumbles with the
error:
----------------------------------------------------------------------
	cc -O -DUSG -i -F 8000 -c grep.c
grep.c
dfa.h(384) : error 34: `index' : field type too small for number of bits
*** Error code 1

Stop.
----------------------------------------------------------------------

If the structure is changed to read:
----------------------------------------------------------------------
typedef struct
{
 	unsigned long index:24;		/* Index into the parse array. */
	unsigned constraint:8;	/* Constraint for matching this position. */
} _position;

-or- 

typedef struct
{
  unsigned long index:24,		/* Index into the parse array. */
	   constraint:8;	/* Constraint for matching this position. */
} _position;
----------------------------------------------------------------------

Then the result is:
----------------------------------------------------------------------
   cd tests; sh regress.sh
egrep: Regular expression too big
cmp: EOF on khadafy.out
Khadafy test failed -- output left on khadafy.out
Spencer test #30 failed ... Spencer test #35 failed
Spencer test #37 failed
Spencer test #41 failed ... Spencer test #47 failed
Spencer test #72 failed ... Spencer test #76 failed
Spencer test #83 failed ... Spencer test #87 failed
Spencer test #92 failed
Spencer test #95 failed ...  Spencer test #115 failed
Spencer test #118 failed
Spencer test #121 failed
*** Error code 1

Stop.
----------------------------------------------------------------------

Running the tests also dumped the core, a stack re-trace of which reads:
----------------------------------------------------------------------
_reganalyze()	from _regcompile+0xe5
_regcompile(0xb130, 0xa, 0xb70,	0x1)	from _main+0x4e3
_main(0x3, 0xb106, 0xb10e)	from __start+0x32
__start()	from start0+0x5
----------------------------------------------------------------------

-- 
smail: mark at siva
uucp : {ames!pacbell!sactoh0|csusac!unify}!siva!mark
geo  : Sacramento, California