tce-load -i compiletc pangomm-dev atkmm-dev gtk3-dev

cd gtkmm-3.22.3

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

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

make [6m 47.25s]
sudo make install