4.4BSD/usr/src/contrib/gcc-2.3.3/config/xm-i386sco.h

/* Configuration for GCC for Intel i386 running SCO.  */

#include "xm-i386v.h"

/* On SCO 3.2.1, ldexp rejects values outside [0.5, 1). */

#define BROKEN_LDEXP

/* Big buffers improve performance.  */

#define IO_BUFFER_SIZE (0x8000 - 1024)

#ifndef __GNUC__
/* The SCO compiler gets it wrong, and treats enumerated bitfields
   as signed quantities, making it impossible to use an 8-bit enum
   for compiling GNU C++.  */
#define ONLY_INT_FIELDS 1
#define CODE_FIELD_BUG 1
#endif