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Know that third party libraries often are not a solution. Often have a limited lifecycle, departed authors, and 90% of code you are not using, yet have to consider in regards of security etc.

For what use? It doesn't make sense to write your own FFT library buy it from NAG.

You don't have to write everything yourself, but just saying be critical and think ahead when choosing which libraries to use and how you use them. One could even consider cherry picking (e.g. functions) from other libraries/projects that you are allowed, licensed to do so to keep your codebase as small as possible for various reasons, including security.

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