ionCube does not work, when I try to install keitaro I get an error, how can I fix it?

Question

Debian

When I try to install keitaro on the server, I get the following error. (Site error: the ionCube
PHP Loader needs to be installed. This is a widely used PHP extension for running ionCube protected PHP code, website security and malware blocking. )

could be a problem?

php -v
phpini