tce-load -i gtk3-dev 

cd gnome-font-viewer-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 Font Viewer 3.22.0
        ==========================

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

        Now type 'make' to build gnome-font-viewer