Hi, Some of Java packages are FTBFS with Java21 due to javac -source and -target version is lower than that is supported in Java21. Well, is there any text / document to use which version should be used for -source and -target version, or is just dropgping those options allowed? Maybe I asked it before but cannot remember the reasons... so I hope someone let me know it. Thanks! -- Hideki Yamane <henrich@iijmio-mail.jp>