hughdagg@Hughs-iMac jpeg % cat config.log               
This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.

configure:538: checking for gcc
configure:615: checking whether the C compiler (gcc -std=c89 ) works
configure:629: gcc -o conftest -std=c89   conftest.c  1>&5
configure:649: checking whether the C compiler (gcc -std=c89 ) is a cross-compiler
configure:654: checking whether we are using GNU C
configure:663: gcc -E conftest.c
configure:681: checking how to run the C preprocessor
configure:702: gcc -E  conftest.c >/dev/null 2>conftest.out
configure:742: checking for function prototypes
configure:765: gcc -c -std=c89  conftest.c 1>&5
configure:792: checking for stddef.h
configure:802: gcc -E  conftest.c >/dev/null 2>conftest.out
configure:828: checking for stdlib.h
configure:838: gcc -E  conftest.c >/dev/null 2>conftest.out
configure:864: checking for string.h
configure:874: gcc -E  conftest.c >/dev/null 2>conftest.out
configure:900: checking for size_t
configure:923: gcc -c -std=c89  conftest.c 1>&5
configure:994: checking for type unsigned char
configure:1003: gcc -c -std=c89  conftest.c 1>&5
configure:1018: checking for type unsigned short
configure:1027: gcc -c -std=c89  conftest.c 1>&5
configure:1042: checking for type void
configure:1072: gcc -c -std=c89  conftest.c 1>&5
configure:1088: checking for working const
configure:1142: gcc -c -std=c89  conftest.c 1>&5
configure:1163: checking for inline
configure:1174: gcc -c -std=c89  conftest.c 1>&5
configure:1224: checking for broken incomplete types
configure:1233: gcc -c -std=c89  conftest.c 1>&5
configure:1248: checking for short external names
configure:1260: gcc -o conftest -std=c89   conftest.c  1>&5
configure:1275: checking to see if char is signed
configure:1306: gcc -o conftest -std=c89   conftest.c  1>&5
configure:1295:5: error: implicitly declaring library function 'printf' with type 'int (const char *, ...)' [-Werror,-Wimplicit-function-declaration]
    printf("Hmm, it seems 'char' is not eight bits wide on your machine.\n");
    ^
configure:1295:5: note: include the header <stdio.h> or explicitly provide a declaration for 'printf'
configure:1302:3: error: implicitly declaring library function 'exit' with type 'void (int) __attribute__((noreturn))' [-Werror,-Wimplicit-function-declaration]
  exit(is_char_signed((int) signed_char_check));
  ^
configure:1302:3: note: include the header <stdlib.h> or explicitly provide a declaration for 'exit'
2 errors generated.
configure: failed program was:
#line 1282 "configure"
#include "confdefs.h"

#ifdef HAVE_PROTOTYPES
int is_char_signed (int arg)
#else
int is_char_signed (arg)
     int arg;
#endif
{
  if (arg == 189) {		/* expected result for unsigned char */
    return 0;			/* type char is unsigned */
  }
  else if (arg != -67) {	/* expected result for signed char */
    printf("Hmm, it seems 'char' is not eight bits wide on your machine.\n");
    printf("I fear the JPEG software will not work at all.\n\n");
  }
  return 1;			/* assume char is signed otherwise */
}
char signed_char_check = (char) (-67);
main() {
  exit(is_char_signed((int) signed_char_check));
}
configure:1323: checking to see if right shift is signed
configure:1358: gcc -o conftest -std=c89   conftest.c  1>&5
configure:1349:3: error: implicitly declaring library function 'printf' with type 'int (const char *, ...)' [-Werror,-Wimplicit-function-declaration]
  printf("Right shift isn't acting as I expect it to.\n");
  ^
configure:1349:3: note: include the header <stdio.h> or explicitly provide a declaration for 'printf'
configure:1345:16: warning: shifting a negative signed value is undefined [-Wshift-negative-value]
  res |= (~0L) << (32-4);
         ~~~~~ ^
configure:1354:3: error: implicitly declaring library function 'exit' with type 'void (int) __attribute__((noreturn))' [-Werror,-Wimplicit-function-declaration]
  exit(is_shifting_signed(-0x7F7E80B1L));
  ^
configure:1354:3: note: include the header <stdlib.h> or explicitly provide a declaration for 'exit'
1 warning and 2 errors generated.
configure: failed program was:
#line 1328 "configure"
#include "confdefs.h"

#ifdef HAVE_PROTOTYPES
int is_shifting_signed (long arg)
#else
int is_shifting_signed (arg)
     long arg;
#endif
/* See whether right-shift on a long is signed or not. */
{
  long res = arg >> 4;

  if (res == -0x7F7E80CL) {	/* expected result for signed shift */
    return 1;			/* right shift is signed */
  }
  /* see if unsigned-shift hack will fix it. */
  /* we can't just test exact value since it depends on width of long... */
  res |= (~0L) << (32-4);
  if (res == -0x7F7E80CL) {	/* expected result now? */
    return 0;			/* right shift is unsigned */
  }
  printf("Right shift isn't acting as I expect it to.\n");
  printf("I fear the JPEG software will not work at all.\n\n");
  return 0;			/* try it with unsigned anyway */
}
main() {
  exit(is_shifting_signed(-0x7F7E80B1L));
}
configure:1375: checking to see if fopen accepts b spec
configure:1390: gcc -o conftest -std=c89   conftest.c  1>&5
configure:1385:5: error: implicitly declaring library function 'exit' with type 'void (int) __attribute__((noreturn))' [-Werror,-Wimplicit-function-declaration]
    exit(0);
    ^
configure:1385:5: note: include the header <stdlib.h> or explicitly provide a declaration for 'exit'
1 error generated.
configure: failed program was:
#line 1380 "configure"
#include "confdefs.h"

#include <stdio.h>
main() {
  if (fopen("conftestdata", "wb") != NULL)
    exit(0);
  exit(1);
}
configure:1436: checking for a BSD compatible install
configure:1488: checking for ranlib
configure:1650: checking libjpeg version number
hughdagg@Hughs-iMac jpeg %