GNOME TWEAK TOOL
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* The first rule of gnome-tweak-tool is do not talk about gnome-tweak-tool
Running
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* If you wish to run the application uninstalled, execute;
./gnome-tweak-tool [-p /path/to/jhbuild/prefix/]
* If you wish to install system wide you must
./autogen.sh && make && make install
TODO
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* I'm not sure if the TweakGroup layer is necessary, and it makes
it hard to categorise things. Perhaps go to a named factory approach
* Do some more things lazily to improve startup speed