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https://issues.apache.org/jira/browse/LUCENE-9767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17283804#comment-17283804
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Robert Muir commented on LUCENE-9767:
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{quote}
I'd add a task to download gennorm2
{quote}

What do you mean, download and compile C code? I think we should let that be :) 
Besides the version of icu4c must match the targeted icu4j version exactly. 

{quote}
If you'd like to take over and try, please go ahead (and push to that PR 
directly)? If not, I'll get back to this later in the evening.
{quote}

I'll try it out, see if I can make some progress, thanks for getting it started!


> port ICU regeneration to gradle build
> -------------------------------------
>
>                 Key: LUCENE-9767
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9767
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Robert Muir
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> When we upgrade ICU dependency we have to regenerate a lot of stuff. The ant 
> build has it all automated.
> You do need icu4c installed corresponding to the icu4j version to regenerate 
> some of the datastructures. There are also some java regenerators that do 
> processing of unicode data and so on.
> Will try to see if I can get this hobbling when I have the time, the icu 
> dependency is quite old at this point. The hard part for me is learning 
> gradle's crazy ways every time, but maybe i can start it off super-ugly with 
> something like shell script that everyone hates, but at least works 
> correctly. 
> cc [~dweiss]



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