Gotta lowercase these too

src/modules/physics/box2d/Body.h

@@ -28,7 +28,7 @@
 #include "physics/Body.h"
 
 // Box2D
-#include <Box2D/Box2D.h>
+#include <box2d/Box2D.h>
 
 namespace love
 {

src/modules/physics/box2d/Contact.h

@@ -27,7 +27,7 @@
 #include "World.h"
 
 // Box2D
-#include <Box2D/Box2D.h>
+#include <box2d/Box2D.h>
 
 namespace love
 {

src/modules/physics/box2d/Fixture.h

@@ -29,7 +29,7 @@
 #include "common/Reference.h"
 
 // Box2D
-#include <Box2D/Box2D.h>
+#include <box2d/Box2D.h>
 
 namespace love
 {

src/modules/physics/box2d/Joint.h

@@ -26,7 +26,7 @@
 #include "physics/Joint.h"
 
 // Box2D
-#include <Box2D/Box2D.h>
+#include <box2d/Box2D.h>
 
 namespace love
 {

src/modules/physics/box2d/Shape.h

@@ -26,7 +26,7 @@
 #include "physics/box2d/Body.h"
 
 // Box2D
-#include <Box2D/Box2D.h>
+#include <box2d/Box2D.h>
 
 namespace love
 {

src/modules/physics/box2d/World.h

@@ -31,7 +31,7 @@
 #include <unordered_map>
 
 // Box2D
-#include <Box2D/Box2D.h>
+#include <box2d/Box2D.h>
 
 namespace love
 {