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Note on building against a non-tagged imgui release

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imgui-sys/README.md
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cargo run --example test_window_impl cargo run --example test_window_impl
### Building a specific revision
cimgui has pre-generated bindings to specific versions of imgui - usually for each regular imgui release, and the WIP docking branch at the same time as the release.
However this will not work if you need to either
1. Build `imgui-rs` against a specific revision, or
2. Build `imgui-rs` against another branch or fork
Luckily running the generator is quite straight forward:
1. Ensure `luajit` is installed (required by cimgui's generator)
2. In the `cimgui` submodule, check out the master branch
3. Update the nested `imgui` submodule (`imgui-sys/third-party/cimgui/imgui/`) to point to your desired upstream `imgui`
4. Run the generator as per https://github.com/cimgui/cimgui#using-generator
5. Run `cargo xtask bindgen` and follow the rest of the steps as usual
## Common sources of problems ## Common sources of problems