It really doesn't help using a tutorial from five years ago on a modern system. Too much has changed.
lirc_rpi has been replaced by dtoverlay=gpio-ir and dtoverlay=gpio-ir-tx in /boot/config.txt. See https://raspberrypi.org/forums/viewtopic.php?t=243583 for more details.
See Prevent dhcpcd from configuring an interface in How to set up networking/WiFi
Add denyinterfaces eth1 to the end of /etc/dhcpcd.conf (but above any other added interface lines).
NOTE eth1 may result in unpredictable results, as there will be a race condition in the enumeration of the interfaces. You should use Predictable Network Interface Names
Raspbian on Raspberry Pi 4 uses ARMv7 binaries while Pi Zero uses ARMv6hf. You can easily use ARMv6hf binaries on ARMv7 CPUs but not the other way around. So build your libraries on your target platform or use cross compilation.
You should look at logrotate: it's a tool designed to run as a cron job which will automatically rotate, compress, delete and mail logfiles based on the rules you write in its config file.
Here's a sample config from the man page:
/usr/bin/killall -HUP syslogd
This means: ...
Try adding this to /boot/config.txt; I had a lot of trouble with a Hannspree HT161 that has a resolution of 1366x768 - this sets to closest HDMI res of 1360 x 768
hdmi_cvt=1360 768 60 3
You need to install the Mariadb packages and the mysql compatibility package in your sysroot.
apt install mariadb-client mariadb-common mysql-common
libmariadb-dev-compat package will create all the links necessary for compatibility between mariadb and mysql.
Then, when you call to qt configure script you must ...