diff -uprN cairo-1.10.0/src/cairo-compiler-private.h cairo-1.10.0.az/src/cairo-compiler-private.h
--- cairo-1.10.0/src/cairo-compiler-private.h	2010-09-02 13:38:55 +0200
+++ cairo-1.10.0.az/src/cairo-compiler-private.h	2010-11-11 14:34:31 +0200
@@ -229,6 +229,10 @@ ffs (int x)
 
 #endif
 
+#if defined(__MINGW32__) && !defined(HAVE_FFS)
+# define ffs __builtin_ffs
+#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