What is "ghc" and why was it installed?

[Fielding, Eric J (US 329A)]

I was running “port selfupdate” and “port upgrade outdated” for the first time in a while, and I noticed that my Intel MacBook Pro was spending almost an hour compiling a port called “ghc” that I don’t remember seeing before and I am sure I did not request. Is this part of something else that was added recently that is now a dependency of some other port?

Thanks,
++Eric
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