tce-load -i git cmake nautilus-dev vala-dev gettext intltool libpeas-dev itstool help2man

cd deja-dup-34.2

edit CMakeLists.txt
set(PKG_LIBDIR "/usr/local/lib/${PACKAGE}")
set(PKG_LIBEXECDIR "/usr/local/lib/${PACKAGE}")

mkdir build
cd build

cmake -DCMAKE_C_FLAGS="-mtune=generic -Os -pipe" -DCMAKE_CXX_FLAGS="-mtune=generic -Os -pipe -fno-exceptions -fno-rtti" -DCMAKE_INSTALL_PREFIX=/usr/local -DENABLE_STATIC=OFF ../

make
sudo make install