For the original Blupimania sources for Smaky, just select the Git TAG v1.5.0 in the blupimania repository. Maybe in the futur, I will add a more complete Smaky dump in this repository with Makefile, etc. used to build with a Smaky computer.
In the repository, you will find the last known sources which were used to build Blupimania for MS-DOS. If you want to hack in the Blupimania sources, it's better (and very recommanded) to use the sources provided in the current officially supported repository instead of this one.
Some sources here are not coming from Epsitec SA then the GPL license cannot be applied (see in the source files). Everything else must be considered as GPL (artistic files too), see the LICENSE file here.
This project is using Turbo C and it's possible that it's referencing files that are out of this scope. This code is provided mostly for history and studying purposes but not for compiling the game for MS-DOS (even if it should be possible with some (a lot?) effort to retrieve the environement, compiler, headers, ...).