gjs 1.73 made changes so that it builds now with meson 0.63. https://buildd.debian.org/status/package.php?p=gjs
Ubuntu cherry-picked some merge proposals that enabled gjs 1.72 to build too. http://launchpadlibrarian.net/614996822/meson_0.63.0-1_0.63.0-1ubuntu3.diff.gz Thank you, Jeremy Bicha
