Custom cabal builds for pandoc 3.*?

[Jim Pryor <jim.pryor.nyu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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I used to follow the instructions at 
<https://pandoc.org/installing.html#custom-cabal-method> to build pandoc 
with the cabal configure `--flags="embed_data_files lua53"`.

Since `git pull`ing to the pandoc 3.* source tree, this no longer builds an 
executable. I see from the Pandoc 3.0 announcement on this list that the 
packaging has split in some ways.

Is it still possible to build all the components with custom cabal 
configure flags? How do I go about it? Can I just cd to the `pandoc-cli` 
subdirectory and do the following there:

```
cabal update

cabal install --only-dependencies

cabal configure --prefix=/usr/local --flags="embed_data_files lua53"

cabal build

./dist-newstyle/build/x86_64-osx/ghc-*/pandoc-*/x/pandoc/build/pandoc/pandoc 
--version

```

Or do I have to first run those steps in the top-level directory, then do 
`cabal install`, then repeat them in the `pandoc-cli` subdirectory? When I 
try to only do the steps in the `pandoc-cli` subdirectory, it seems like a 
binary version of the main `pandoc` library is being downloaded, rather 
than one built using my custom configure flags.

Is the option to build using the Lua 5.3 engine still available? I've been 
fiddling around and it seems like however I do the build, I end up with a 
pandoc executable that says it uses the Lua 5.4 engine.


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