Compiling must be done with the same compiler version and the same optimization settings that were used on mozilla. Before installing galeon, you need to download galeon.patch from and place it into your source directory. Install galeon by running the following commands: patch -Np0 -i ../galeon.patch && ./configure --prefix=/opt/gnome --with-mozilla-snapshot=1.0 \ --with-mozilla-libs=/opt/mozilla/lib/mozilla \ --with-mozilla-includes=/opt/mozilla/include/mozilla/ --disable-werror && make && make install