WillAyd commented on PR #47318:
URL: https://github.com/apache/arrow/pull/47318#issuecomment-3186716311

   Ah cool. I didn't realize conda patched RapidJSON like that.
   
   I guess the problem is that Meson is using pkg-config to search for the 
dependency, and being header-only there is no .pc file distributed with it (I 
think this is intentional, but if not I don't see a .pc file when installing 
locally via conda).
   
   Per Meson's dependency detection logic, I wonder if we just need to be more 
clear that rapidjson should be detected as a system dependency, and let it 
search the PATH for the header:
   
   https://mesonbuild.com/Dependencies.html#dependency-detection-method


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