Running on Linux without installing.

[timinaust]

Looking for a quick way to check out this version ...

Make sure you have the python 3.9 installed and working. Open a terminal windows and type ...

$ python3 --version
Python 3.9.10

Installing wxPython. This is the complicated part ...

If you just use a standard pip install, it will be quite slow as it has to recompile from scratch. So read the instructions here, and in particular check if there is a pre-built binary here

If you see your linux flavour and version, use ...

$ pip install -U -f https://extras.wxpython.org/wxPython4/extras/linux/gtk3/xxxxxxx wxPython

If there isn't a prebuilt version for your flavour of Linux, then do the following ...

$ sudo apt-get install build-essential libgtk-3-dev
$ pip install -U wxPython

(Warning - this may take some time and use 1+GB disk space).

Download metamorphose2 zip files from this branch of this repository and expand.
Download exif zip files from Ianare's exif repository.

Expand and move the contents of the exif-py-master/exif-py-master to metamorphose2.../metamorphose2.../src/exif folder.

Run ./metamorphose2

Hint: You can rename and move folders to make them more convenient to find.

[apelly]

You can probably improve your compile time out of this world by:
$export MAKEFLAGS="-j$(nproc)"

Information about improving compile time from here

[apelly]

Also, shouldn't this note be in the readme so people find it before they look to raise an issue?