diff -Naur firefox-62.0.2-orig/gfx/angle/checkout/src/compiler/translator/SymbolTable_autogen.cpp firefox-62.0.2/gfx/angle/checkout/src/compiler/translator/SymbolTable_autogen.cpp
--- firefox-62.0.2-orig/gfx/angle/checkout/src/compiler/translator/SymbolTable_autogen.cpp	2018-09-20 19:41:23.000000000 +0300
+++ firefox-62.0.2/gfx/angle/checkout/src/compiler/translator/SymbolTable_autogen.cpp	2018-10-03 14:30:16.693344732 +0300
@@ -9,6 +9,8 @@
 // SymbolTable_autogen.cpp:
 //   Compile-time initialized built-ins.
 
+#include <cmath>
+
 #include "compiler/translator/SymbolTable.h"
 
 #include "angle_gl.h"