The latest version is 2.1.
src2pkg is produced as a noarch package. Unlike most other packages however, there are post-install actions that must be completed manually if you are installing src2pkg for the first time.
Install the base noarch package through your usual package manager from the command line. Once installed, run the command: src2pkg --setup to setup src2pkg for use on your system. The --setup switch automatically compiles and installs a few small helper applications.
Download the contents of the src2pkg-2.1 source directory and run the src2pkg.build-noarch script provided. This will rebuild all of the above listed package types.
If you're feeling brave, go ahead and add your own. src2pkg.build-noarch is just a bash script afterall!