The OpenWRT-Toolchain depends (among others) on the following software:

• Subversion
• GNU Make
• GNU G++
• GNU AWK
• Flex
• ZLib (header files)
• Ncurses (header files)

On an Ubuntu 12.04 issue the following command:

sudo apt-get install git subversion build-essential libncurses-dev libz-dev gawk flex

Building the target system requires the following additional packages:

• Perl XML::Parser
• GNU C Compiler (cross compiler for avr)

On Ubuntu 12.04 you can issue the following command:

sudo apt-get install libxml-parser-perl gcc-avr avr-libc

• Run install.sh in the openwrt folder of the git repository passing a directory for the build environment as parameter
• change to the given folder and run make