Also, Ant no longer has a build-time dependency on a particular JDK.
It finds the JDK via $JAVA_HOME or $PATH (by looking up javac). This
way, we don't need to have separate packages like apacheAntOpenJDK and
apacheAntOracleJDK. It also seems reasonable: after all, installing
GNU Make doesn't give you a C compiler either. It does mean that
instead of
buildInputs = [ ant ];
you now need to write something like
buildInputs = [ ant jdk ];
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