4.4BSD/usr/src/contrib/gcc-2.3.3/config/xm-fx2800.h

/* Alliant FX/2800 running Concentrix 2.x. */

#include "xm-i860.h"

/*
 * vfprintf is not present prior to Concentrix 2.2. Unfortunately, there
 * does not seem to be a cpp symbol that identifies OS revision. Undefine
 * the following if running 2.1 or older.
 *  -- hyc@hanauma.jpl.nasa.gov
 */

#define HAVE_VFPRINTF