Software development kits for Atari Lynx

There are three development environments that I know of:

• Epyx development kit Original Epyx development kit with an Amiga 2000 machine**. Consists of special hardware and Amiga based development tools. This is unavailable to almost everyone and less practical in general.
• newcc65, lyxass and BLL Consists of newcc65, a fork of the original cc65 for writing 6502 code in C, with an additional compiler for 65(S)C02 assembler lyxass and a library for the Atari Lynx called BLL (Behind Lynx Lines) by Bastian Schick. Bastian has recently started modernizing his tooling which can be found on GitHub here: https://github.com/42Bastian/. In particular the repositories for lyxass, sprpck, new_bll, lynx_hacking are of interest.
• cc65 The modern compiler suite for multi-targeting 6502-based consoles. cc65 is still in active development and seems the more versatile toolset as it also targets around 20+ other consoles. The source code can be found on GitHub at https://github.com/cc65/cc65. Note: this is a different version from the cc65 that led to newcc65

Setting up cc65

cc65 requires certain environment variables to be set for the C compiler, assembler and linker.

Typically, the root or installation location for cc65 is C:\Program Files\cc65 for Windows and /usr/share/cc65 for Linux distributions.

You can set