diff --git a/core/Makefile b/core/Makefile
index 4420e0901f..77b18b61c4 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -2054,6 +2054,7 @@ $(INTERNAL_SDK_TARGET): $(deps)
 			-v "TARGET_CPU_ABI=$(TARGET_CPU_ABI)" \
 			-v "DLL_EXTENSION=$(HOST_SHLIB_SUFFIX)" \
 			-v "FONT_OUT=$(SDK_FONT_TEMP)" \
+			-v "JACK_SDKTOOL_VERSION=$(JACK_SDKTOOL_VERSION)" \
 			-o $(PRIVATE_DIR) && \
 		cp -f $(target_notice_file_txt) \
 				$(PRIVATE_DIR)/system-images/android-$(PLATFORM_VERSION)/$(TARGET_CPU_ABI)/NOTICE.txt && \
diff --git a/core/config.mk b/core/config.mk
index 85c850a204..8c02055267 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -489,8 +489,6 @@ prebuilt_sdk_tools_bin :=
 # ---------------------------------------------------------------
 # Generic tools.
 JACK := $(HOST_OUT_EXECUTABLES)/jack
-JACK_JAR := $(HOST_OUT_JAVA_LIBRARIES)/jack.jar
-JILL_JAR := $(HOST_OUT_JAVA_LIBRARIES)/jill.jar
 
 LEX := prebuilts/misc/$(BUILD_OS)-$(HOST_PREBUILT_ARCH)/flex/flex-2.5.39
 # The default PKGDATADIR built in the prebuilt bison is a relative path
@@ -553,7 +551,6 @@ endif
 # Turn off jack warnings by default.
 DEFAULT_JACK_EXTRA_ARGS += --verbose error
 
-JILL := java -Xmx3500m -jar $(JILL_JAR)
 PROGUARD := external/proguard/bin/proguard.sh
 JAVATAGS := build/tools/java-event-log-tags.py
 RMTYPEDEFS := $(HOST_OUT_EXECUTABLES)/rmtypedefs