Subversion lets you embed working copies of other repositories using externals, allowing easy version control of third-party library software in your project.

While these seem ideal for the reuse of libraries and version control of vendor software, they aren't without their critics:

Please don't use Subversion externals (or similar in other tools), they are an anti-pattern and, therefore, unnecessary

Are there hidden risks in using externals? Please explain why they would they be considered an antipattern.

svn version-control anti-patterns svn-externals
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