$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }

How to Install Flatpak on RHEL-based Distros

RHEL-based Installing Flatpak Guide

How to Install Flatpak on RHEL-based GNU/Linux desktops – Step by step Tutorials.

And Flatpak for CentOS is a technology for Building, Distributing, Installing and Running Linux Apps.

Finally, Flatpak is primarily targeted at the Linux desktop, although it can also be used as the basis for application distribution in other contexts, such as embedded systems.

How to Install Flatpak on CentOS GNU/Linux Distro

GNU/Linux RHEL-based Flatpak Installation Guide