cannot open input source file

Hello everyone, I just wanted to use a keypad that's why I found a keypad library on Github I added the library and when I wanna build the project I receive this : error:  #5: cannot open source input file "gpio.h": No such file or directory. I don't where can I find the source input file "gpio.h" I searched it on the internet, but didn't find anything.

Thanks in advance

Ali

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