Flux 2 - Failed to find C compile

After update to plugin version 1.53.0 I cannot use Flux 2 Klein, it fails with error:

Server error: Failed to find C compiler. Please specify via CC environment variable or set triton.knobs.build.impl

Previous version worked fine, I have not made any changes in settings or setup. Error also affects General Editing, on the other hand Cinematic Photo (XL) or Digital Artwork still work fine.

I use Kubuntu 24.04 Krita installed as a flatpak Krita AI Diffusion Plugin Diagnostics attached in a file: Krita AI Diffusion Plugin Diagnostics.txt