lightdm-webkit2-greeter build error. My system os is ubuntu 16.04.

i installed 'stable' Dependencies. meson and ninja to pip3 installed. You provide 'OBS Repo' , ubuntu 16.04 hava a Dependencies error : lightdm-webkit2-greeter : Depends: libgtk-3-0 (>= 3.21.4) but 3.18.9-1ubuntu3.3 is to be installed Forgive me poor English, I hope you can understand what I mean.

start to error code:

limo@Ins:/tmp$ proxychains4 git clone https://github.com/Antergos/lightdm-webkit2-greeter.git /tmp/greeter
[proxychains] config file found: /etc/proxychains.conf
[proxychains] preloading /usr/lib/libproxychains4.so
[proxychains] DLL init: proxychains-ng 4.12-git-12-g1a62ec6
Cloning into '/tmp/greeter'...
[proxychains] DLL init: proxychains-ng 4.12-git-12-g1a62ec6
[proxychains] Strict chain  ...  127.0.0.1:1088  ...  github.com:443  ...  OK
[proxychains] DLL init: proxychains-ng 4.12-git-12-g1a62ec6
remote: Counting objects: 4294, done.
remote: Compressing objects: 100% (11/11), done.
[proxychains] DLL init: proxychains-ng 4.12-git-12-g1a62ec6
remote: Total 4294 (delta 6), reused 15 (delta 5), pack-reused 4275
Receiving objects: 100% (4294/4294), 7.75 MiB | 2.90 MiB/s, done.
Resolving deltas: 100% (2493/2493), done.
Checking connectivity... [proxychains] DLL init: proxychains-ng 4.12-git-12-g1a62ec6
done.
limo@Ins:/tmp$ cd greeter/build/
limo@Ins:/tmp/greeter/build$ git checkout stable
Branch stable set up to track remote branch stable from origin.
Switched to a new branch 'stable'
limo@Ins:/tmp/greeter/build$ git checkout ${LATEST_RELEASE_TAG}
Your branch is up-to-date with 'origin/stable'.
limo@Ins:/tmp/greeter/build$ git branch 
  master
* stable
limo@Ins:/tmp/greeter/build$ meson --prefix=/usr --libdir=lib ..
The Meson build system
Version: 0.44.0
Source dir: /tmp/greeter
Build dir: /tmp/greeter/build
Build type: native build
Project name: lightdm-webkit2-greeter
Native C compiler: cc (gcc 5.4.0)
Build machine cpu family: x86_64
Build machine cpu: x86_64
Found pkg-config: /usr/bin/pkg-config (0.29.1)
Native dependency dbus-glib-1 found: YES 0.106
Native dependency liblightdm-gobject-1 found: YES 1.18.3
Native dependency x11 found: YES 1.6.3
Native dependency gtk+-3.0 found: YES 3.18.9
Native dependency webkit2gtk-4.0 found: YES 2.18.5
Native dependency webkit2gtk-web-extension-4.0 found: YES 2.18.5
Configuring config.h using configuration
Native dependency glib-2.0 found: YES 2.48.2
WARNING: GLib compiled dependencies do not work reliably with 
the current version of GLib. See the following upstream issue: https://bugzilla.gnome.org/show_bug.cgi?id=774368
Build targets in project: 7
Found ninja-1.7.2 at /usr/local/bin/ninja
limo@Ins:/tmp/greeter/build$ ninja 
ninja: error: '../src/src/gresource/css/style.css', needed by 'src/greeter-resources.c', missing and no known rule to make it

Antergos / web-greeter

build error #154

lightdm-webkit2-greeter build error. My system os is ubuntu 16.04.