Thanks Björn for helping me with one issue!
PS: The very short manual @ http://www.libreoffice.org/developers-2/ caused the problem
Someone with admin rights may change this to that: sudo apt-get build-dep openoffice.org && sudo apt-get install git libgnomeui-dev gawk junit4 # Debian & derivatives, because sudo apt-get build-dep libreoffice didn’t work properly (Something is still missing [The thing needed to compile HTML Code – Don’t ask me, I am not a dev 😉 )