Stuart H, that is almost the intent, and probably close enough for this kind of documentation.
The full gory details are as follows:
Clojure can build and run with Java version 1.5 or later. A Java version 1.5 build of Clojure only works if you do not run the test suite, e.g. by using the command "ant jar". To build Clojure including running the test suite, or to use the new reducers library, requires Java 1.6 or later.
If the patch for CLJ-1109 is applied, the full gory details become simpler to state:
Clojure can build and run with Java version 1.5 or later. Using the new reducers library requires Java 1.6 or later.
changes-draft-v1.md is not a patch, but an outline of a proposed new changes.md file for Clojure 1.5 with some of the content fleshed out. It still has lots of occurrences of "TBD" for "To Be Documented" in it.
It does mention every ticket that had a patch committed since Clojure 1.4.0 until Nov 15 2012.
I am hoping someone who is more knowledgeable of the "TBD" parts takes this and runs with it.