Make sure you installed the BuildDependencies.
Do not build as root, always build as user.
Get and install the repo tool
mkdir bin cd bin wget http://android.git.kernel.org/repo chmod a+x repo cd ..
mkdir replicant-2.2 cd replicant-2.2 ../bin/repo init -u git://gitorious.org/replicant/manifest.git -b replicant-2.2 ../bin/repo sync
cd ~/replicant-2.2 ../bin/repo sync source build/envsetup.sh export ANDROID_JAVA_HOME=$JAVA_HOME lunch replicant_dream_sapphire-eng make -j$(echo "$(grep 'processor' /proc/cpuinfo | wc -l ) + 1" | bc) distimages #uses arguments like -j9 to speed up build in case of multi-core cpu
<pre> You will find your built images in ./out/target/product/dream_sapphire/. You will also find fastboot, needed to install the images, in ./out/host/linux-x86/bin/. Now you are ready to "install!":http://trac.osuosl.org/trac/replicant/wiki/Installation