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Pino Toscano authored
So far, the code for Xplanet was built only if the xplanet tool was found at build time, which was not really needed since all it changed was a "build or not build" setting. Also, since it is a tool that can be present or missing at runtime, doing the checks at that point is still needed. Hence, making the Xplanet code unconditionally built: the amount of code is small, and this reduces the risk of bit rotting. The cmake check is left to give an indication about the runtime dependency, but that is about it. Furthermore, add a existance check when xplanet is invoked, so there is a proper message about its lack.
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