SOURCE_URL=url of app's source
SOURCE_SUM=sha256 b345072f426e52cda594a45a5096e6351ba5c42c3d4f8f4088a00c1c707cae7d
SOURCE_SUM_PRG=b345072f426e52cda594a45a5096e6351ba5c42c3d4f8f4088a00c1c707cae7d
SOURCE_FORMAT=tar.gz
SOURCE_IN_SUBDIR=true
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SOURCE_EXTRACT=true