fatal error: string.h: No such file or directory

pip install –upgrade yowsup Running setup.py install for python-axolotl-curve25519 … error Complete output from command /app/.heroku/python/bin/python -u -c “import setuptools, tokenize;__file__=’/tmp/pip-build-1_bwcn69/python-axolotl-curve25519/setup.py’;f=getattr(tokenize, ‘open’, open)(__file__);code=f.read().replace(‘\r\n’, ‘\n’);f.close();exec(compile(code, __file__, ‘exec’))” install –record /tmp/pip-7_4easy4-record/install-record.txt –single-version-externally-managed –compile: /app/.heroku/python/lib/python3.8/site-packages/setuptools/dist.py:473: UserWarning: Normalizing ‘0.4.1-2’ to ‘0.4.1.post2’ warnings.warn( running install running build running build_ext building ‘axolotl_curve25519’ extension creating build creating build/temp.linux-x86_64-3.8 creating build/temp.linux-x86_64-3.8/curve creating build/temp.linux-x86_64-3.8/curve/ed25519…

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