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diff --git a/gfx/cairo/cairo/src/cairo-compiler-private.h b/gfx/cairo/cairo/src/cairo-compiler-private.h
index ffac9ce..9a05831 100644
--- a/gfx/cairo/cairo/src/cairo-compiler-private.h
+++ b/gfx/cairo/cairo/src/cairo-compiler-private.h
@@ -229,16 +229,20 @@ ffs (int x)
 
     if (_BitScanForward(&i, x) != 0)
 	return i + 1;
 
     return 0;
 }
 #endif
 
+#elif defined(__WIN32__) && defined(__GNUC__)
+
+#define ffs(x) __builtin_ffs(x)
+
 #endif
 
 #if defined(_MSC_VER) && defined(_M_IX86)
 /* When compiling with /Gy and /OPT:ICF identical functions will be folded in together.
    The CAIRO_ENSURE_UNIQUE macro ensures that a function is always unique and
    will never be folded into another one. Something like this might eventually
    be needed for GCC but it seems fine for now. */
 #define CAIRO_ENSURE_UNIQUE                       \