Some time ago there were some concerns about spkg not having the exact same output for the package lists in /var/log/packages as the original pkgtools by ruario in this thread in the forums: http://www.salixos.org/forum/viewtopic.php?f=20&t=2980

I don't know if he actually got to contacting the spkg developer about them, but I took the liberty of forking spkg in github and I made all these changes anyway. spkg should now have the exact same output as pkgtools do (unless I missed something).

My github repo is here:
https://github.com/gapan/spkg

I did some other minor changes in the process too (some typos fixed and some info added to the man page). We're not going to update our spkg package for 13.37, but we most probably will for the next version (whenever that comes).

Feel free to try it out. You can just clone the repo and run
./autogen.sh
make

and a spkg (dynamic) binary will be created in the src/ directory.