Dir.exists? removed in Ruby 3.2

[ScotterC]

Extconf uses Dir.exists? which was removed in Ruby 3.2 (ruby-lang issue)

nmatrix/ext/nmatrix/extconf.rb

Lines 57 to 64 in beb266e

	Dir.mkdir("data") unless Dir.exists?("data")
	Dir.mkdir("util") unless Dir.exists?("util")
	Dir.mkdir("storage") unless Dir.exists?("storage")
	Dir.chdir("storage") do
	Dir.mkdir("yale") unless Dir.exists?("yale")
	Dir.mkdir("list") unless Dir.exists?("list")
	Dir.mkdir("dense") unless Dir.exists?("dense")
	end

To those running into this problem here's a monkey patch gem file_exists which is really just this alias_method

[alexis]

And it's possible to install it by adding it to a Gemfile, with RUBYOPT='-rfile_exists' bundle. (Though N[] syntax didn't work for me in ruby 3.2).

[translunar]

I don't think anyone is maintaining this library anymore. I encourage you to fork it if you'd like to!

[kojix2]

Use numo-narray.
https://github.com/ruby-numo/numo-narray

[barracuda156]

Got the same error; it should just be patched to use exist? instead.