Missing dependancies of rtree

I am currently using Spyder for Python, and I have this error message when I open the program: Error: You have missing dependencies!

rtree>= 0.8.3: None (NOK)

Please install them to avoid this message.

Note: Spyder could work without some of these dependencies, however to have a smooth experience, we strongly recommend.

I tried pip install rtree and got:

Collecting rtree
  Downloading https://files.pythonhosted.org/packages/11/1d/42d6904a436076df813d1df632575529991005b33aa82f169f01750e39e4/Rtree-0.9.3.tar.gz (520kB)
     |████████████████████████████████| 522kB 467kB/s
    ERROR: Command errored out with exit status 1:
     command: 'C:UsersgitteAnaconda3python.exe' -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\Users\gitte\AppData\Local\Temp\pip-install-kmbt5h2t\rtree\setup.py'"'"'; __file__='"'"'C:\Users\gitte\AppData\Local\Temp\pip-install-kmbt5h2t\rtree\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'rn'"'"', '"'"'n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base pip-egg-info
         cwd: C:UsersgitteAppDataLocalTemppip-install-kmbt5h2trtree
    Complete output (11 lines):
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "C:UsersgitteAppDataLocalTemppip-install-kmbt5h2trtreesetup.py", line 3, in <module>
        import rtree
      File "C:UsersgitteAppDataLocalTemppip-install-kmbt5h2trtreertree__init__.py", line 1, in <module>
        from .index import Rtree
      File "C:UsersgitteAppDataLocalTemppip-install-kmbt5h2trtreertreeindex.py", line 6, in <module>
        from . import core
      File "C:UsersgitteAppDataLocalTemppip-install-kmbt5h2trtreertreecore.py", line 128, in <module>
        raise OSError("could not find or load %s" % lib_name)
    OSError: could not find or load spatialindex_c-64.dll
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

Please advise what I can do. Spyder works great so far, I just don’t want to have issues along the way. Thanks!

Answer

It looks like Rtree requires libspatialindex (https://libspatialindex.org) which is not automatically installed. It seems some devs are aware of the problem and working on a fix:

https://github.com/Toblerity/rtree/issues/146 https://github.com/Toblerity/rtree/issues/147