Declaring dependencies that will be proposed during the installation of lib

Using Arduino Programming Questions
#1

Previously, Arduino’s documentation was clear about not installing dependencies (as described here)

But, the new IDE release (1.8.10) says that “libraries can now declare dependencies that will be proposed during lib installation”.

how can I define dependencies in my library?

#2

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source https://groups.google.com/a/arduino.cc/forum/#!topic/developers/mi5DmJA3iPc

#3