I'm not entirely sure why ModPlugDecoder.cpp was #including set.h, but it certainly doesn't need to be...

src/modules/sound/lullaby/ModPlugDecoder.cpp

@@ -20,7 +20,6 @@
 
 #include "ModPlugDecoder.h"
 
-#include <set>
 #include <common/Exception.h>
 
 namespace love
@@ -59,12 +58,12 @@ namespace lullaby
 
 	bool ModPlugDecoder::accepts(const std::string & ext)
 	{
-		static const std::string supported[] = {
-			"699", "abc", "amf", "ams", "dbm", "dmf",
-			"dsm", "far", "it", "j2b", "mdl", "med",
-			"mid", "mod", "mt2", "mtm", "okt", "pat",
-			"psm", "s3m", "stm", "ult", "umx", "wav",
-			"xm", ""
+		static const std::string supported[] = {
+			"699", "abc", "amf", "ams", "dbm", "dmf",
+			"dsm", "far", "it", "j2b", "mdl", "med",
+			"mid", "mod", "mt2", "mtm", "okt", "pat",
+			"psm", "s3m", "stm", "ult", "umx", "wav",
+			"xm", ""
 		};
 
 		for(int i = 0; !(supported[i].empty()); i++)