diff -r 000000000000 -r 6474c204b198 gfx/cairo/nonfatal-assertions.patch
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/cairo/nonfatal-assertions.patch	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+diff -r b79d47dad1ea gfx/cairo/cairo/src/cairoint.h
+--- a/gfx/cairo/cairo/src/cairoint.h	Fri Jun 08 18:09:53 2007 -0700
++++ b/gfx/cairo/cairo/src/cairoint.h	Fri Jun 29 09:18:02 2007 +0200
+@@ -159,6 +159,13 @@ CAIRO_BEGIN_DECLS
+ 
+ #ifndef M_PI
+ #define M_PI 3.14159265358979323846
++#endif
++
++#ifndef NDEBUG
++#undef assert
++#define assert(expr) \
++    do { if (!(expr)) fprintf(stderr, "Assertion failed at %s:%d: %s\n", \
++          __FILE__, __LINE__, #expr); } while (0)
+ #endif
+ 
+ #undef  ARRAY_LENGTH