Remove unnecessary variable and fix run target.

Makefile

@@ -1,10 +1,8 @@
 include env.mk
 
-SRC = src
-
 JC = $(JAVA_HOME)/bin/javac
 
-JCFLAGS = -target 1.1 -source 1.2 -sourcepath $(SRC) -cp $(HEADERS) -Xlint:-options -d build -g:none
+JCFLAGS = -target 1.1 -source 1.2 -sourcepath $(SRC_DIR) -cp $(HEADERS) -Xlint:-options -d build -g:none
 
 SRC_DIR := src
 
@@ -33,5 +31,5 @@ clean:
 pack result.jar: $(CLS)
 	$(JAVA_HOME)/bin/jar -cmf META-INF/MANIFEST.MF result.jar -C build . -C res .
 
-run: release
+run: pack
 	$(EMULATOR) result.jar