[GitHub] [arrow-cookbook] lidavidm commented on issue #323: [C++] C++ cookbooks are failing to find zlib

["lidavidm (via GitHub)" <gi...@apache.org>]

lidavidm commented on issue #323:
URL: https://github.com/apache/arrow-cookbook/issues/323#issuecomment-1703614341

   It looks like it installs libzlib, which has libz.so, but not the header. zlib contains the actual header. 
   
   I suppose:
   - Arrow depends on zlib at build time, but only libzlib at runtime.
   - This is sufficient for anyone just linking to Arrow.
   - But if you also want to link to zlib yourself, you need to also install the headers.
   - I'm not sure what the policy of conda-forge is on transitive compilation dependencies: gRPC appears to require zlib as well if you want to build against gRPC, but of course if you're just using gRPC that's not necessary.
   - So we should just explicitly list zlib. (I think.)
   
   ```
   > jq .files $CONDA_PREFIX/conda-meta/libzlib-1.2.13-hd590300_5.json                                                                                                   (arrow-cookbook) 
   [
     "lib/libz.so.1",
     "lib/libz.so.1.2.13"
   ]
   > jq .files $CONDA_PREFIX/conda-meta/zlib-1.2.13-hd590300_5.json                                                                                                      (arrow-cookbook) 
   [
     "include/zconf.h",
     "include/zlib.h",
     "lib/libz.a",
     "lib/libz.so",
     "lib/pkgconfig/zlib.pc"
   ]
   ```


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