Building Prism is similar to building McCoy, but there are some differences which is why a separate build documentation article. To build prism, you must first build the xulrunner tree, and then build prism.

Make sure you have the required build prerequisites.

Grab the latest release source code from Mozilla's ftp site. Extract the source code, and you should have a directory called mozilla/.

Change directory into mozilla/ and checkout the latest prism code :

cd mozilla/ svn co prism
Create a file called .mozconfig make sure it is in the mozilla/ directory. The contents of the file should look something like this :
mk_add_options MOZ_CO_PROJECT=xulrunner
mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/mozilla-obj
ac_add_options --enable-application=xulrunner
ac_add_options --disable-debug
ac_add_options --enable-optimize
ac_add_options --disable-tests
ac_add_options --disable-javaxpcom

Build xulrunner :

make -f build

 Once the build is done, there will be a directory called mozilla-obj. Go into the prism/ directory and create a .mozconfig file

mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/mozilla-obj/prism
ac_add_options --with-libxul-sdk=../dist
ac_add_options --enable-application=prism

You need to define an environment variable to point the build to the new .mozconfig. This variable is called MOZCONFIG

export MOZCONFIG=$PWD/.mozconfig #this should point to mozilla/prism/.mozconfig

Go back to the mozilla/ directory and do another build, this time, prism will get built

cd ../
make -f build

Congratulations, you have just built prism. You can now find the executable in mozilla-obj/prism/dist/bin/prism. If you want to create a package, go to mozilla-obj/prism and call

make package

You will find the package in dist/