Source
--- src/3rdparty/javascriptcore/JavaScriptCore/wtf/MathExtras.h.orig 2017-06-08 07:29:22.000000000 -0700
+++ src/3rdparty/javascriptcore/JavaScriptCore/wtf/MathExtras.h 2017-09-30 13:12:02.000000000 -0700
// Work around a bug in the Mac OS X libc where ceil(-0.1) return +0.
inline double wtf_ceil(double x) { return copysign(ceil(x), x); }
-#define ceil(x) wtf_ceil(x)
+//#define ceil(x) wtf_ceil(x)
#endif