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The "free", open source, lib files for Arduino are great unless you have different hardware or want to do something differently.  For example, the keypad lib is for a 3 X 3 keypad whereas I have a 4 X 4.  To modify this, or any other open source lib file, I'll need a C compiler.  Years ago, I had a couple that ran on windows but not anymore.  What would be a simple, cheap, compiler that I could use to modify lib files?  Thanks, Gary

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