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02a2dd9d7a
When the directory is created during the build process, it is as root. This prevents us deleting root-owned files inside the directory during make clean. In client/build/, we get around this because the directory contains a tracked file, so it's created during git checkout. We make this the case for build-external by adding a hidden, empty file to track. This won't fix existing checkouts though, so we also add a fix-up step to make clean. The use of .gitignore as the empty file to track is taken from https://git.wiki.kernel.org/index.php/GitFaq#Can_I_add_empty_directories.3F Specifically: "If you really need a directory to exist in checkouts you should create a file in it. .gitignore works well for this purpose"