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There could be several reasons why the egui dependency is missing when building a Rust project. Here are some possible causes:

1. The egui dependency may not be included in the project's Cargo.toml file or in the dependencies list in another file.

2. The egui dependency may not be installed on the system. In this case, you can install it using the Cargo package manager by running the command cargo install egui.

3. The version of the egui dependency specified in the project's Cargo.toml file may be outdated or incompatible with the rest of the project's dependencies. In this case, you can try updating the version to a more recent one or checking for compatibility issues with other dependencies.

4. There may be a network or connectivity issue preventing the project from downloading the egui dependency from its repository. This can be resolved by checking the internet connection or trying again later.

5. The egui dependency may have been removed from the repository or may no longer be maintained. In this case, you may need to find an alternative library or consider contributing to the development of egui yourself.