Issues building it!

[buffetmonster]

Hi Guys, was having a look at your little project. Was trying to get this to run on raspberry pi 4, (think it's 64 bit OS) but it doesn't build.
I changed delayMicroseconds to usleep and added #include "unistd.h".
But couldn't fix the issue with wiringPi.h, seems it's deprecated?
sudo apt-get install wiringpi
#E: Package 'wiringpi' has no installation candidate
Anyway, it's old and maybe you're not fascinated to fix it, fair enough? But thought I'd let you know in any case :)