what ubuntu version do you use? did you install all of packages before build the bsp??
for more detailed inforamtion you can refer to the user guide, I list the packages you need to install firstly.
$ sudo apt-get install gettext libgtk2.0-dev rpm bison m4 libfreetype6-dev
$ sudo apt-get install libdbus-glib-1-dev liborbit2-dev intltool
$ sudo apt-get install ccache ncurses-dev zlib1g zlib1g-dev gcc g++ libtool
$ sudo apt-get install uuid-dev liblzo2-dev
$ sudo apt-get install tcl dpkg
$ sudo apt-get install asciidoc texlive-latex-base dblatex xutils-dev
$ sudo apt-get install texlive texinfo
$ sudo apt-get install lib32z1 lib32ncurses5 lib32bz2-1.0
$ sudo apt-get install libc6-dev-i386
$ sudo apt-get install u-boot-tools
$ sudo apt-get install scrollkeeper
$ sudo ln -s /usr/lib/x86_64-linux-gnu/librt.so /usr/lib/librt.so