autoconf is required for building the OpenJDK, but the installation instructions for setting up Linux to build OpenJDK only mention the build-essential package which doesn't include autoconf (see https://packages.ubuntu.com/focal/build-essential).
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Commit openjdk/jdk/c3c1cdd1
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Review(master) openjdk/jdk21u-dev/2181
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Review(master) openjdk/jdk/17826