tce-load -i compiletc meson vala-dev gsound-dev libgweather-dev gnome-desktop-dev geoclue-dev gettext desktop-file-utils itstool

cd gnome-clocks-3.28.0

mkdir build
cd build

CC="gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -mtune=generic -Os -pipe -fno-exceptions -fno-rtti" meson --prefix=/usr/local --localstatedir=/var --buildtype=plain

ninja
sudo ninja install

    gnome-clocks 3.22.0

    prefix: /usr/local
    Vala compiler: /usr/local/bin/valac
    C compiler: gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe

    Now type 'make' to build gnome-clocks