Create/copy your project folder into the 3DS-app-dev folder and copy clean.bat, build.bat, the app folder and _Makefile from the yeti3DS project folder into your project folder. Also copy the 3DSBannerMaker folder into the devkitpro folder and makerom into devkitARM/bin for the first time setup.
Adjust settings in _Makefile (not necessarily).
Replace/change the files in the app folder for your project.
Double click on build.bat and let it build your project.
NOTE: If you enable KEEP_DEBUG_ELF in _Makefile it creates a copy of the .elf file before it get's stripped.
Requires DevkitARM, Python 2.X and PIL Python image library.
NOTE: The batch files only work on Windows. There are no bash files for Linux yet and makerom is not build for Linux either.
smealum libctru, yeti3DS port
3DSGuy makerom, BannerAudio.bcwav
Snailface 3DSBannerMaker
profi200 makefiles
Provided by the respective copyright holders of the included software/source code.