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

Step by step – Boost Installation on Ubuntu 20.04 Guide

May 10, 2021 | By the+gnu+linux+evangelist.

GNU/Linux Ubuntu 20.04 Installing Latest Boost C++ – Step by step Guide

How to Install Latest Boost C++ Libraries in Ubuntu 20.04 Focal LTS GNU/Linux desktop – Step by step Tutorial.

And Boost for Ubuntu Focal provides Free Peer-Reviewed Portable C++ Source Libraries.

They emphasize Libraries that work well with the C++ Standard Library and usable across a Broad Spectrum of Applications.

Finally, this guide includes detailed instructions on Getting Started with Boost C++ Libraries on Ubuntu.

Step-by-step – Boost Ubuntu 20.04 Installation Guide
  1. 1. Launching Shell Emulator

    Open a Terminal window
    Ctrl+Alt+t on desktop
    (Press “Enter” to Execute Commands)

    Latest Boost Ubuntu 20.04 Installation Guide - Open Terminal Shell Emulator
    In case first see: Terminal QuickStart Guide.