It now builds cleanly, but I cut a few code stubs

common/gameplay/character_defines.hpp

@@ -22,6 +22,8 @@
 #ifndef CHARACTERDEFINES_HPP_
 #define CHARACTERDEFINES_HPP_
 
+#include <cmath>
+
 //the speeds that the characters move
 constexpr double CHARACTER_WALKING_SPEED = 140.0;
 constexpr double CHARACTER_WALKING_MOD = 1.0/sqrt(2.0);

common/gameplay/combat_defines.hpp

@@ -28,6 +28,7 @@
 enum class TerrainType {
 	NONE = 0,
 	GRASSLANDS,
+	//etc.
 };
 
 #endif