https://manpages.ubuntu.com/manpages/xenial/man3/XUnloadFont.3.html
Ubuntu Manpage: XLoadFont, XQueryFont, XLoadQueryFont, XFreeFont,
ubuntumanpage
https://manpages.ubuntu.com/manpages/xenial/man3/XFreeFont.3.html
Ubuntu Manpage: XLoadFont, XQueryFont, XLoadQueryFont, XFreeFont,
ubuntumanpage
https://manpages.ubuntu.com/manpages/xenial/man3/XChar2b.3.html
Ubuntu Manpage: XLoadFont, XQueryFont, XLoadQueryFont, XFreeFont,
ubuntumanpage
https://manpages.ubuntu.com/manpages/xenial/man3/XGetFontProperty.3.html
Ubuntu Manpage: XLoadFont, XQueryFont, XLoadQueryFont, XFreeFont,
ubuntumanpage