Vamos a instalar Xfce Theme Manager en Debian Stretch.

Obs:

• Uso Debian Stretch de 64 bits.

Entramos a la terminal y tecleamos lo siguiente:
cd ~
wget -c http://khapplications.darktech.org/zips/xfcethememanager/Xfce-Theme-Manager-0.3.7.tar.gz
tar -xzvf Xfce-Theme-Manager-0.3.7.tar.gz
cd Xfce-Theme-Manager-0.3.7

Entramos a la carpeta.
sudo apt update
sudo apt install build-essential libspice-client-glib-2.0-dev libgtk2.0-dev libxfce4ui-1-dev
sudo apt clean
sudo apt autoclean
./configure --prefix=/usr
make
sudo make install
xfce-theme-manager