Set "required: false", in build instructions, so meson will use the subproject when dep not found.

Status Job ID Name Coverage
  Build
passed #807856
api-visibility

00:00:28

passed #807858
build-debian-clang

00:03:23

passed #807857
build-debian-gcc

00:02:41

passed #807859
build-fedora-gcc

00:06:38

passed #807860
flatpak
build-flatpak

00:04:57

passed #807861
flatpak
build-flatpak-glade

00:07:20

 
  Test+Docs
passed #807862
build-gtkdoc

00:02:59

passed #807863
unit-test

00:02:17

44.6%
 
  Package
passed #807864
package-debian-buster

00:03:37

 
  Test Package
passed #807865
autopkgtest-debian-buster-package

00:02:41

passed #807866
lintian-debian-buster-package

00:01:05