tce-load -i intltool gtk3-dev geocode-glib-dev gnome-desktop-dev libnotify-dev libcanberra-dev gnome-weather geoclue-dev itstool libgweather-dev gsound-dev vala-dev

cd gnome-clocks-3.22.0

CC="gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -mtune=generic -Os -pipe -fno-exceptions -fno-rtti"  ./configure --prefix=/usr/local --disable-static --localstatedir=/var

find . -name Makefile -type f -exec sed -i 's/-g -O2//g' {} \;

make
sudo make 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