Added 64bit build

Makefile

@@ -1,14 +1,28 @@
 # mingw32-gcc
-GCC = /usr/bin/i686-w64-mingw32-gcc -D _WXI_MINGW
-INCLUDE_DIR = -I/usr/i686-w64-mingw32/include 
 CFLAGS = -Wl,--export-all-symbols
-LIB_DIR = -L/usr/i686-w64-mingw32/lib/
 LIBS = -ldxguid -ldinput -ldinput8
 
-xinput1_3.dll: xinput1_3/xinput1_3_main.c
-	${GCC} -shared ${CFLAGS} ${INCLUDE_DIR} ${LIB_DIR} $? ${LIBS} -o $@
+GCC32 = /usr/bin/i686-w64-mingw32-gcc -D _WXI_MINGW
+INCLUDE_DIR32 = -I/usr/i686-w64-mingw32/include 
+LIB_DIR32 = -L/usr/i686-w64-mingw32/lib/
+
+build/32/xinput1_3.dll: xinput1_3/xinput1_3_main.c
+	mkdir -p build/32/
+	${GCC32} -shared ${CFLAGS} ${INCLUDE_DIR32} ${LIB_DIR32} $? ${LIBS} -o $@
+
+GCC64 = /usr/bin/x86_64-w64-mingw32-gcc -D _WXI_MINGW
+INCLUDE_DIR64 = -I/usr/x86_64-w64-mingw32/include 
+LIB_DIR64 = -L/usr/x86_64-w64-mingw32/lib/
+
+build/64/xinput1_3.dll: xinput1_3/xinput1_3_main.c
+	mkdir -p build/64/
+	${GCC64} -shared ${CFLAGS} ${INCLUDE_DIR64} ${LIB_DIR64} $? ${LIBS} -o $@
 
 clean:
 	rm -f *.o *.dll
 
-all: xinput1_3.dll
+32bit: build/32/xinput1_3.dll
+
+64bit: build/64/xinput1_3.dll
+
+all: build/32/xinput1_3.dll