NethServer Version: 7.5.1804 final
To be able to install eGroupware I installed nethserver-php-scl module by @stephdl.
After that I did
yum-config-manager --enable remi-php72 yum update php\*
to replace default version with remi version 7.2 (see https://blog.remirepo.net/post/2018/09/14/PHP-version-5.6.38-7.0.32-7.1.22-and-7.2.10)
Now I was able to install eGroupware and everything else seems to work properly.
But I don’t know what implication that will have eventually. I just tried if it works on a VM-testmachine without having the knowledge what I was really doing
I’d be pleased if someone could tell me or give a link to read about.