Some changes.

Makefile

@@ -6,8 +6,6 @@ SRC_DIR := src
 
 RES_DIR := res
 
-PHEADERS = $(HEADERS):$(JAVA_HOME)/jre/lib/rt.jar
-
 rwildcard=$(wildcard $1$2) $(foreach d,$(wildcard $1*),$(call rwildcard,$d/,$2))
 
 SRCS := $(call rwildcard,$(SRC_DIR),*.kt)
@@ -31,11 +29,11 @@ clean:
 	rm -rf jars/
 
 jars/result.jar: jars/classes.jar
-	-$(RETROTRANSLATOR) -srcjar jars/classes.jar -destjar jars/result.jar
-	jar -umf META-INF/MANIFEST.MF jars/result.jar -C res .
+	proguard -include proguard.conf -libraryjars $(HEADERS) -keepclassmembers class $(CLASSNAME) { public \<methods\> ';' } -keep public class $(CLASSNAME)
 
 release jars/release.jar: jars/result.jar
-	proguard -include proguard.conf -libraryjars $(PHEADERS) -keepclassmembers class $(CLASSNAME) { public \<methods\> ';' } -keep public class $(CLASSNAME)
+	-$(RETROTRANSLATOR) -srcjar jars/result.jar -destjar jars/release.jar
+	$(JAVA_HOME)/bin/jar -umf META-INF/MANIFEST.MF jars/release.jar -C res .
 
 run:
-	$(EMULATOR) jars/result.jar 
+	$(EMULATOR) jars/release.jar 

proguard.conf

@@ -1,5 +1,5 @@
--injars jars/result.jar(!**.kotlin_builtins,!META-INF/main.kotlin_module,!META-INF/services/**)
--outjars jars/release.jar
+-injars jars/classes.jar(!**.kotlin_builtins,!META-INF/main.kotlin_module,!META-INF/services/**)
+-outjars jars/result.jar
 -dontwarn org.jetbrains.**
 -dontwarn net.sf.retrotranslator.**
 -dontwarn edu.emory.mathcs.backport.**