I don’t know how can i package or cook or what is the method for compiling.
I Have slitaz 4.0
GNU C Compiler version 4.5.2 (GCC)
And please correct me if is not the place for my post 
You have to first install the packages dependences to build ETL, synfig-core and synfigstudio following these general build instructions:
wiki.synfig.org/wiki/Dev:Build_Instructions
-G
you can install slitaz from within ubuntu using a frugal or manual install (see slitaz manual) if you manually edit the grub menu configuration
Hope it helps!!