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

How to Install Linux Kernel Headers on RHEL-based Distros

GNU/Linux RHEL-based Installing Kernel Headers Guide

How to Install Linux Kernel Headers on RHEL-based GNU/Linux Distributions – Step by step Tutorial.

And the CentOS Kernel Headers contain the C Header Files for the Linux Kernel.

Which offers the various Function and Structure Definitions required when Compiling any Code that Interfaces with the Kernel, such as Kernel Modules or Device Drivers and some User Programs.

Possibly to Install a Custom Kernel with Headers you may see: Installing New Kernel from Source.

Finally, this Setup is Valid also for All the others RHEL Based Distros like:

  • Red Hat Enterprise Linux
  • Oracle Enterprise Linux
  • Rocky Linux
  • AlmaLinux
How to Install Linux Kernel Headers on CentOS GNU/Linux Distro

GNU/Linux RHEL-based Kernel Headers Installation Guide