环境：树莓派4B

使用sudo apt-get install wiringpi 指令安装wiringpi包时，出现下面的提示：

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package wiringpi is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'wiringpi' has no installation candidate

解决方案：

Gordon在该链接中写道树莓派Raspberry pi 4B版本中需要用到新的2.52的wiringpi包，安装方式为

cd /tmp
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb

wiringPi updated to 2.52 for the Raspberry Pi 4B | Wiring Pi