The libreCMC project ships different flavored images to achieve a desired result and for the continued support of hardware with limited resources. These different flavors include:
Provides an easier to use out of the box experience; includes the luci web interface, full package management support and basic IPv6 stack. These images only run on routers with 8M of flash or more.
A bare-bones image with package management, basic IPv6 stack and no web interface. These images run on routers with <8M of flash, but package management is limited on 4M targets.
While similar to Main images, these images are targeted at routers with 4M of flash; provide the luci web-ui (no ssl support), basic IPv6 stack and no package management.
As always, libreCMC can be built from source or you can submit an issue to request a missing feature.