Is this a bug in lcc-win32?

The program reproduced below has recently been posted in comp.lang.c,
but unfortunately when trying to compile it with lcc-win32, the
compilation aborts with an error. As pointed out in some of the
followups, it is believed the problem is with lcc-win32, and further
questions should be in this group.

It has been argued that the error is *not allowed* to show up with
'-ansic', but also that it *should not* show up without '-ansic'.

The error message is

----snip----
 lc -ansic -A -O -c ronu.c -o ronu.obj
Error ronu.c: 62  redefinition of 'ConstraintFailed'
Error c:\lcc\include\safelib.h: 3  Previous definition of
'ConstraintFailed' here
Warning ronu.c: 62  inconsistent linkage for 'ConstraintFailed' previously
declared at c:\lcc\include\safelib.h 3
2 errors, 1 warning
1 error
----snip----


Here is the complete program triggering the compile error, reproduced
with the author's permission:

----snip----
/*
 * runum.c
 *
 * Copyright (c) 2008, John J. Smith
 *
 * Permission to use, copy, modify, distribute, and sell this software 
 * and its do***entation for any purpose except in homework assignments 
 * is hereby granted without fee, provided that the above copyright 
 * notice appear in all copies and that both that copyright notice and 
 * this permission notice appear in sup****ting do***entation.
 *
 */

/*
 * Requirements:
 *
 * the program for converting the integers to roman
 * numerals using file(s) in the c language from 1-5000 range
 *
 */

#include <stdio.h>
#include <string.h>

/* 
 * the biggest foobarfoobar that foofoobarbar will accept
 */
#define MAX_FOOBARFOOBAR    5000

#define M   1000
#define D    500
#define C    100
#define L     50
#define X     10
#define V      5
#define I      1
#define N      0

/*
 * struct: foofoofoofoo
 *
 * purpose: map foofoofoobar values to their corresponding
 *          foofoobarfoo values
 *
 */
#define M1(a)   { #a , (a) }
#define M2(a,b) { #a #b , (b)-(a) }

static struct { 
    char *foofoofoobar;
    int foofoobarfoo;
} foofoofoofoo[] = { 
    M1(M),M2(C,M),M1(D),M2(C,D),M1(C),M2(X,C),M1(L),
    M2(X,L),M1(X),M2(I,X),M1(V),M2(I,V),M1(I),M1(N),
};
#define N_FOOFOOFOOFOO \
    ((sizeof foofoofoofoo) / (sizeof foofoofoofoo[0]))

#undef M1
#undef M2

static int ConstraintFailed(void) { return -1; }

/*
 * function: foofoobarbar
 *
 * purpose: convert a foobarfoobar value to foobarbarfoo
 *
 * parameters:
 *      foobarfoobar: value to be converted
 *      foobarbarfoo: buffer that receives the converted foobarfoobar
 *
 * notes:
 *      it is the callers responsiblility that foobarbarfoo is 
 *      sufficiently large
 */
static int foofoobarbar(int foobarfoobar, char *foobarbarfoo)
{
    int barfoobarfoo = 0;
    size_t barbarfoofoo;
    char *foobarbarbar;

    if(foobarfoobar < 0 || foobarfoobar > MAX_FOOBARFOOBAR) {
        barfoobarfoo = ConstraintFailed();
        strcpy(foobarbarfoo, "ERROR!"); goto barfoobarbar;
    }
    else if(foobarfoobar == 0) {
        strcpy(foobarbarfoo, "N"); goto barfoobarbar;
    }

    for(foobarbarbar = foobarbarfoo, *foobarbarbar = 0, barbarfoofoo = 0;
        barbarfoofoo < N_FOOFOOFOOFOO-1; barbarfoofoo++) {
        while(foobarfoobar >= foofoofoofoo[barbarfoofoo].foofoobarfoo) {
            char *barfoofoofoo = foofoofoofoo[barbarfoofoo].foofoofoobar;
            size_t barfoofoobar = strlen(barfoofoofoo);
            memcpy(foobarbarbar, barfoofoofoo, barfoofoobar);
            foobarbarbar += barfoofoobar;
            foobarfoobar -= foofoofoofoo[barbarfoofoo].foofoobarfoo;
        }
    }
    *foobarbarbar = '\0';

barfoobarbar:
    return barfoobarfoo;
}

/*
 * function: foobarfoofoo
 *
 * purpose: as per spec, use file foobarfoobar
 *
 * parameters: (none)
 */
static int foobarfoofoo(void)
{
    FILE *foobarfoobar;
    printf("Using file... ");
    if((foobarfoobar = tmpfile()) != NULL) {
        printf("success!!!\n");
        fclose(foobarfoobar);
        return 0;
    } else {
        printf("failed.\n");
        return 1;
    }
}


/*
 * function: main
 *
 * purpose: program's entry point
 *          invokes foofoobarbar() MAX_FOOBARFOOBAR times
 */
int main(void)
{
    int foobarfoobar;
    char foobarbarfoo[64];

    printf("John's Table of Roman Numerals\n"
           "Copyright (c) MMVIII, John J. Smith\n\n");
    foobarfoofoo();
    printf("\n"
           " arabic | roman\n"
           "--------+----------------------\n");
    for(foobarfoobar = 0; 
         foobarfoobar <= MAX_FOOBARFOOBAR; 
          foobarfoobar++) {
        foofoobarbar(foobarfoobar, foobarbarfoo);
        printf("  %5d | %s\n", foobarfoobar, foobarbarfoo);
    }
    return 0;
}

/* end ronum.c */
----snip----