Assuming most of the required modules are already installed, this might be as small as 100 MiB. If most modules are needed (or you omit `--system-site-packages`), it might be 600 MiB, which is similar to a miniconda install.
You'll need libgeos-dev (`sudo apt install libgeos-dev`) and likely various libqt libraries.
This is tested on a minimal Ubuntu 22.04 docker image (`docker pull ubuntu:22.04; docker run -it ubuntu:22.04`) as of 2022-09-27 by Alan De Smet.
For non-Ubuntu systems, you'll need to adjust package installation to your system.
You need git (to get glance) and python's venv module (to at least isolate glance's install, but also any other modules you need that aren't available from the system).
As root:
```
apt update
apt install -y git python3-venv
```
**Optional**: To allow glance to use system-wide module installations, do this. This takes about 933 MiB on a _minimal_ Ubuntu install.
**Optional**: This provide a system-wind module isntall for the GUI components. It takes about 430 MiB on a _minimal_ Ubuntu install.
As root:
```
apt install -y python3-pyqt5
```
**If** you didn't install the system-wide packages, you'll need basic build tools to install some modules (at least cartopy). In that case, you'll need this. It's about 100 MiB on a _minimal_ Ubuntu install.
As root:
```
apt install -y build-essentials python3-dev
```
**IF** you didn't install the system-wide packages, and you want GUI support, you'll need the QT5 library. It's about 360 MiB on a _minimal_ Ubuntu install.
As root:
```
apt install -y libqt5gui5
```
Finally, as a user install glance. The `pip install` should do no actual installs for any system-wide modules that are present. Alternatively, you can omit `--system-site-packages` to force local installed, perhaps for testing.
