GSHwHack.cpp:799:55: error: no member named 'exp2' in namespace 'std'
--- a/pcsx2/GS/Renderers/HW/GSHwHack.cpp
+++ b/pcsx2/GS/Renderers/HW/GSHwHack.cpp
@@ -7,2 +7,3 @@
 #include "GS/GSUtil.h"
+#include <cmath>