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If you don't want to go through the effort of setting up a build environment for the firmware, you can just flash prebuilt firmware binaries using UniFlash/DSLite. Prebuilt firmware binaries are attached to releases on the GitHub releases tab of this project. When using prebuilt firmware, be sure to use the Python code corresponding to the release tag rather than master to avoid compatibility issues with firmware that is behind the master branch.
The arm-none-eabi-gcc provided through various Linux distributions' package manager often lacks some header files or requires some changes to linker configuration. For minimal hassle, I suggest using the ARM GCC linked above. You can just download and extract the prebuilt executables.
The TI SDK is provided as an executable binary that extracts a bunch of source code once you accept the license agreement. On Linux and Mac, the default installation directory is inside~/ti/. This works fine and my makefiles expect this path, so I suggest just going with the default here. The same applies for the TI SysConfig tool.
Once the SDK has been extracted, you will need to edit one makefile to match your build environment. Within ~/ti/simplelink_cc13xx_cc26xx_sdk_7_41_00_17 (or wherever the SDK was installed) there is a makefile named imports.mak. The only paths that need to be set here to build Sniffle are for GCC, XDC, cmake and SysConfig. We don't need the CCS compiler. See the diff below as an example, and adapt for wherever you installed things.
