http://kompozer.sf.net/dev/ 1. Check the build requirements: Linux, MacOS X, Windows. Warning: KompoZer 0.8.x is built against Gecko 1.8.1 2. Get the code tarball here: http://prdownloads.sourceforge.net/kompozer/kompozer-*-src.*?download 3. Unzip the source: tar -xjf kompozer-*-src.tar.bz2 4. Edit the mozilla/.mozconfig file according to your wishes and system configuration. There are mozconfig files for Fedora, Linspire, Debian/Ubuntu, MacOS X and Windows in the mozilla/composer/config directory. 5. Build the code: cd mozilla make -f client.mk build_all 6. Test your build in the obj-kompozer/dist/bin directory. ../obj-kompozer/dist/bin/kompozer