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Cartopy-Pip-Installationsfehler 'Proj 4.9.0 must be installed.' beheben

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Problem:

Beim Versuch, cartopy z.B. mit pip install -U cartopy zu installieren, erscheint diese Fehlermeldung:

cartopy_proj_error.txt
Collecting cartopy
  Downloading Cartopy-0.19.0.post1.tar.gz (12.1 MB)
     |████████████████████████████████| 12.1 MB 13.2 MB/s
  Installing build dependencies ... done
  Getting requirements to build wheel ... error
  ERROR: Command errored out with exit status 1:
   command: /usr/bin/python3 /tmp/tmp2q7tvpo8 get_requires_for_build_wheel /tmp/tmpfwd5htse
       cwd: /tmp/pip-install-dg2i313t/cartopy
  Complete output (1 lines):
  Proj 4.9.0 must be installed.
  ----------------------------------------
ERROR: Command errored out with exit status 1: /usr/bin/python3 /tmp/tmp2q7tvpo8 get_requires_for_build_wheel /tmp/tmpfwd5htse Check the logs for full command output.

Lösung

proj installieren mit z.B.

install_proj.sh
sudo apt -y install libproj-dev

und dann cartopy erneut installieren mit z.B.

install_cartopy.sh
pip install -U cartopy
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