title: Missing dependancies of rtree
body: <p>I am currently using Spyder for Python, and I have this error message when I open the program:
  Error:
  You have missing dependencies!</p>
  
  <p>rtree>= 0.8.3: None (NOK)</p>
  
  <p>Please install them to avoid this message.</p>
  
  <p>Note: Spyder could work without some of these dependencies, however to have a smooth experience, we strongly recommend.</p>
  
  <p>I tried pip install rtree and got:</p>
  
  <pre><code>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:\Users\gitte\Anaconda3\python.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('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base pip-egg-info
           cwd: C:\Users\gitte\AppData\Local\Temp\pip-install-kmbt5h2t\rtree\
      Complete output (11 lines):
      Traceback (most recent call last):
        File "&lt;string&gt;", line 1, in &lt;module&gt;
        File "C:\Users\gitte\AppData\Local\Temp\pip-install-kmbt5h2t\rtree\setup.py", line 3, in &lt;module&gt;
          import rtree
        File "C:\Users\gitte\AppData\Local\Temp\pip-install-kmbt5h2t\rtree\rtree\__init__.py", line 1, in &lt;module&gt;
          from .index import Rtree
        File "C:\Users\gitte\AppData\Local\Temp\pip-install-kmbt5h2t\rtree\rtree\index.py", line 6, in &lt;module&gt;
          from . import core
        File "C:\Users\gitte\AppData\Local\Temp\pip-install-kmbt5h2t\rtree\rtree\core.py", line 128, in &lt;module&gt;
          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.
  </code></pre>
  
  <p>Please advise what I can do.  Spyder works great so far, I just don't want to have issues along the way.  Thanks!</p>