# Find Zephyr. This also loads Zephyr's build system. cmake_minimum_required(VERSION 3.13.1) list(APPEND BOARD_ROOT ${CMAKE_SOURCE_DIR}) find_package(Zephyr) project(zmk) # Add your source file to the "app" target. This must come after # find_package(Zephyr) which defines the target. target_sources(app PRIVATE src/main.c)