Posting here as perhaps I’m not the only one having this trouble. I’ve been having a rough go at building the latest lv_micropython. I’ve installed this on a fresh debian stable build, with ESP-IDF v4.2. I’m able to pull the repo and build mpy-cross, but when it comes to building the esp32 firmware, I get the above error. I’ve found, however, that updating cmake from buster-backports from version 3.13 to 3.16 fixes the cmake errors and builds the image properly.
I’m not sure at this point if this is just a documentation change, or if it’s the intent of the lv_micropython repo maintainers to keep things current with Debian (and perhaps other derivative distributions). If any of the repo maintainers read this and would like some further details, screenshots, whatever, let me know.