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Please mind that URL for git fetching has been changed. Replace /etc/layman/overlays/brancik-overlay.xml with this:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE repositories SYSTEM "/dtd/repositories.dtd">
<repositories xmlns="" version="1.0">
<repo quality="experimental" status="official">
        <name>brancik-overlay</name>
        <description>Ctibor Brancik's overlay</description>
        <homepage>https://dev.brancik.cz/git/brancik-overlay/</homepage>
        <owner type="project">
                <email>ctibor@brancik.cz</email>
                <name>Ctibor Brančík</name>
        </owner>
        <source type="git">https://git.brancik.cz/brancik-overlay.git</source>
</repo>
</repositories>

Then readd overlay like this:

layman -d brancik-overlay
layman -S
layman -a brancik-overlay