### Error installing Jupyterlab in macOS

On macOS, with SageMath 9.2 installed via Conda, I ~~am trying ~~tried to install Jupyterlab as follows:

```
(sage) $ sage -i jupyterlab_widgets
```

However, I get the following error message:

```
make: *** No rule to make target 'all-toolchain'. Stop.
```

The same error appears if I only try

```
(sage) $ sage -i jupyterlab
```

How can I avoid this error and complete the install?

Additional information. I am using a MacBook Pro with macOS ~~10.13.6. ~~10.13.6,
and SageMath 9.2 ~~is ~~was installed using ~~conda:~~conda as follows:

```
$ conda config --add channels conda-forge
$ conda config --set channel_priority strict
$ conda create -n sage sage python=3.8
```

I can launch SageMath in the Jupyter notebook with no problems using the commands:

```
$ conda activate sage
(sage) $ sage -n jupyter
```

Many ~~thanks~~thanks.