Before gcc 4.5, the deprecated option did not take the optional string
argument (see [1]). This caused compilation to fail with gcc < 4.5.
[1] http://gcc.gnu.org/gcc-4.5/changes.html
/* Define GUESTFS_WARN_DEPRECATED=1 to warn about deprecated API functions. */
#define GUESTFS_DEPRECATED_BY(s)
#if GUESTFS_WARN_DEPRECATED
-# if defined(__GNUC__) && GUESTFS_GCC_VERSION >= 30100 /* gcc >= 3.1.0 */
+# if defined(__GNUC__) && GUESTFS_GCC_VERSION >= 40500 /* gcc >= 4.5 */
# undef GUESTFS_DEPRECATED_BY
# define GUESTFS_DEPRECATED_BY(s) __attribute__((__deprecated__(\"change the program to use guestfs_\" s \" instead of this deprecated function\")))
# endif