:~/$ sudo apt-get install build-essential pkg-config autoconf xorg-dev gettext
# evt. libiconv-hook-dev libtext-iconv-perl libtool aclocal
:~/$ git clone http://git.fluxbox.org/fluxbox.git/
:~/$ cd fluxbox
:~/fluxbox$ ./autogen.sh
:~/fluxbox$ ./configure
:~/fluxbox$ make
:~/fluxbox$ sudo make install
:~/fluxbox$ cd
:~/$ which fluxbox
/usr/local/bin/fluxbox