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#   define GD_VERSION 10000
#   define GD_VERSION_STRING "?"
# endif
#else
#  define GD_VERSION ((GD_MAJOR_VERSION * 10000) +\
                      (GD_MINOR_VERSION * 100) +\
                      GD_RELEASE_VERSION)
#endif

/* libgd implements and exports gdImageBoundsSafe() (gd.c), but at least the
 * 2.4.0 gd.h no longer declares it publicly (gdImageBoundsSafeMacro in
 * gd_intern.h is internal-only). Redeclare it here; this is harmless even
 * against a gd.h that does declare it, since the signature is identical. */
#if GD_VERSION >= 20400
extern int gdImageBoundsSafe(gdImagePtr im, int x, int y);
#endif

/* gdPaletteQuantizationMethod and gdUhdrFormat are plain C enums, not
 * preprocessor macros, so the #ifdef checks generated by ExtUtils::Constant
 * would never see them. Paint them blue with harmless self-referential
 * macros so #ifdef succeeds while the enumerator value still resolves