the official buildscript =)

#!/bin/bash
# mybuild3.sh
# my custom script to download, build and flash

# note the start time
START=$(date +%s)

# assign variable
DEVICE="$1"

# start from the beginning, if needed
case "$DEVICE" in
    buildall)
        # make the needed directories
        cd ~
        mkdir -p ~/bin
        mkdir -p ~/android/system
        # download repo and make executable
        curl http://android.git.kernel.org/repo > ~/bin/repo
        chmod a+x ~/bin/repo
        # reload terminal
        source .bashrc
        # change to the proper directory and download the source
        cd ~/android/system/
        repo init -u git://github.com/CyanogenMod/android.git -b gingerbread
        echo -ne \\r
        echo -ne \\r
        # create local_manifest, make a link to it in the right place
        cp ~/Saved/local_manifest.xml ~/android/system/.repo/manifests/
        ln -s ~/android/system/.repo/manifests/local_manifests.xml ~/android/system/.repo/local_manifest.xml
        # download source
        repo sync -j16
        ;;
    clean)
        make clean
        rm -rf ./out
        ;;
esac

# get rom manager
cd vendor/cyanogen
./get-rommanager

# prepare to build kernel
cd ~/android/system && . build/envsetup.sh && lunch cyanogen_captivatemtd-eng

# change to kernel directory and build kernel
cd ~/android/system/kernel/samsung/aries && ./build.sh captivatemtd

# change to top of build directory and build, using ccache to speed things up
cd ~/android/system && USE_CCACHE=1 brunch captivatemtd

# push zip to connected phone and flash
eat

# calculate and show elapsed time
END=$(date +%s)
ELAPSED=$((END - START))
E_MIN=$((ELAPSED / 60))
E_SEC=$((ELAPSED - E_MIN * 60))
printf "Elapsed: "
[ $E_MIN != 0 ] && printf "%d min(s) " $E_MIN
printf "%d sec(s)\n" $E_SEC