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I'm trying to compile emacs 28.2 (from https://ftp.gnu.org/gnu/emacs/) with json support on a Ubuntu-based system (Linux Mint). But I don't get it to work meaning that json-available-p is void and I cannot use the json-parse-string function.

I installed the libjansson-dev library and added --with-json as a parameter to configure. It shows Does Emacs use -ljansson? yes. But within emacs the json-support is not working. What else do I need or am I missing something?

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    @phils Ohh, yes! Thanks. I updated the problem ;-)
    – dmw64
    Commented Nov 30, 2022 at 10:15
  • 1
    When you do ldd `which emacs` | grep jans does libjansson show up? If not, you're going to have to recompile.
    – g-gundam
    Commented Nov 30, 2022 at 14:17
  • Also, out of curiosity, what happens when you do (require 'json) in your current emacs?
    – g-gundam
    Commented Nov 30, 2022 at 14:21
  • @g-gundam No, ldd which emacs` | grep jans` is empty. Not sure why since configure showing jansson to be used... Using (require 'json) does not complain and returns json.
    – dmw64
    Commented Dec 1, 2022 at 8:22
  • How did you start Emacs. Are you sure that you are using the newly built Emacs?
    – dalanicolai
    Commented Dec 1, 2022 at 9:40

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