What is necessary to create an Electrum wallet for altcoins?

What is necessary to create an Electrum wallet for altcoins?

I’m simply wondering what it would take for one to create a Electrum wallet for an altcoin. I realize this is dependent on the technology its built on, but if it for example were a Litecoin-clone, how would one go about to do this in broad strokes?

Thanks!

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