Step-by-step guide to compiling OpenJDK 16 from GitHub sources on a 64-bit Raspberry Pi 4. Covers installing prerequisites via apt and SDKMAN (JDK 15 as boot JDK), cloning the openjdk/jdk repository, running bash configure, and executing make images. The full build takes roughly 60 minutes on a Raspberry Pi 4 with 8GB RAM, producing a working JDK 16-internal build verified with java -version.
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