运行 make -j4 时，如果我从根目录java.mk删除了预建目录，则开始在 JAVA_SDK_VERSION 需要帮助
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=4.0.4
TARGET_PRODUCT=full_toro
TARGET_BUILD_VARIANT=eng
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
TARGET_ARCH_VARIANT=armv7-a-neon
HOST_ARCH=x86
HOST_OS=darwin
HOST_BUILD_TYPE=release
BUILD_ID=IMM76I
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build/core/base_rules.mk:166: *** prebuilt/android-arm/gdbserver: MODULE.TARGET.EXECUTABLES.gdbserver already defined by device/samsung/tuna/prebuilt/android-arm/gdbserver. Stop.