tried, remove it from windows build, will need portable codes elsewhere

src/CMakeLists.txt

@@ -152,6 +152,9 @@ set(GD_PROGRAMS gdcmpgif)
 
 if (PNG_FOUND)
 	set(GD_PROGRAMS ${GD_PROGRAMS} gdtopng pngtogd webpng)
+	if (WIN32 AND NOT MINGW AND NOT MSYS)
+		set(GD_PROGRAMS ${GD_PROGRAMS} webpng)
+	endif (WIN32 AND NOT MINGW AND NOT MSYS)
 	if (ZLIB_FOUND)
 		set(GD_PROGRAMS ${GD_PROGRAMS} gdparttopng gd2topng pngtogd2)
 	endif()

src/webpng.c

@@ -41,95 +41,6 @@ static void usage(const char *msg)
 		fprintf(stderr, "\nError: %s\n", msg);
 	exit(msg == NULL ? 0 : 1);
 }
-static const char letters[] =
-"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
-
-#ifdef _MSC_VER
-extern int optind, opterr, optopt;
-extern char *optarg;
-/* This is only used here */
-int
-mkstemp (char *tmpl)
-{
-  int len;
-  char *XXXXXX;
-  static unsigned long long value;
-  unsigned long long random_time_bits;
-  unsigned int count;
-  int fd = -1;
-  int save_errno = errno;
-
-#define ATTEMPTS_MIN (62 * 62 * 62)
-
-  /* The number of times to attempt to generate a temporary file.  To
-     conform to POSIX, this must be no smaller than TMP_MAX.  */
-#if ATTEMPTS_MIN < TMP_MAX
-  unsigned int attempts = TMP_MAX;
-#else
-  unsigned int attempts = ATTEMPTS_MIN;
-#endif
-
-  len = strlen (tmpl);
-  if (len < 6 || strcmp (&tmpl[len - 6], "XXXXXX"))
-    {
-      errno = EINVAL;
-      return -1;
-    }
-
-/* This is where the Xs start.  */
-  XXXXXX = &tmpl[len - 6];
-
-  /* Get some more or less random data.  */
-  {
-    SYSTEMTIME      stNow;
-    FILETIME ftNow;
-
-    // get system time
-    GetSystemTime(&stNow);
-    stNow.wMilliseconds = 500;
-    if (!SystemTimeToFileTime(&stNow, &ftNow))
-    {
-        errno = -1;
-        return -1;
-    }
-
-    random_time_bits = (((unsigned long long)ftNow.dwHighDateTime << 32)
-                        | (unsigned long long)ftNow.dwLowDateTime);
-  }
-  value += random_time_bits ^ (unsigned long long)GetCurrentThreadId ();
-
-  for (count = 0; count < attempts; value += 7777, ++count)
-    {
-      unsigned long long v = value;
-
-      /* Fill in the random bits.  */
-      XXXXXX[0] = letters[v % 62];
-      v /= 62;
-      XXXXXX[1] = letters[v % 62];
-      v /= 62;
-      XXXXXX[2] = letters[v % 62];
-      v /= 62;
-      XXXXXX[3] = letters[v % 62];
-      v /= 62;
-      XXXXXX[4] = letters[v % 62];
-      v /= 62;
-      XXXXXX[5] = letters[v % 62];
-
-      fd = open (tmpl, O_RDWR | O_CREAT | O_EXCL, _S_IREAD | _S_IWRITE);
-      if (fd >= 0)
-    {
-      errno = save_errno;
-      return fd;
-    }
-      else if (errno != EEXIST)
-    return -1;
-    }
-
-  /* We got out of the loop because we ran out of combinations to try.  */
-  errno = EEXIST;
-  return -1;
-}
-#endif
 
 static void err(const char *fmt, ...)
 {