When installing Virtualenv install I get locustio error 1
run in terminal xcode-select --install this will install the xcode comand line tools (not xcode itself), you will be asked for a password and to agree to a license.
This happens because one (or more) of the packages include C extensions that need compilation, and to compile the xcode command line tools are needed.
A separate solution would be to install Anaconda python, miniconda if you don't need packages for scientific python, this python distribution includes a package manager (conda) that work much like pip but with the advantage of having precompiled packages
install bottleneck by pip error (macos) ERROR: Failed building wheel for bottleneck; error: command 'gcc' failed with exit status 1
The problem is that Xcode Command-line Tools needs to be updated.
Go back to your terminal:
xcode-select --install
You'll then receive:
xcode-select: note: install requested for command line developer tools
And be prompted in a window to update Xcode Command Line tools.
After the update is completed, open a new terminal window and your development tools should be returned.
Addition: With any major or semi-major update you'll need to update the command line tools in order to get them functioning properly again. Check Xcode with any update. This goes beyond Mojave...
After that restart your terminal
Getting Errors while installing airflow using pip install apache-airflow in macOS Catalina
Your issue is typically related to Xcode toolkit.
Type this command in your terminal
xcode-select --install
If that doesn't work, you can always try to update the toolkit first.
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