For cmake and idf.py to work

CMakeLists.txt

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+# The following lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+set (EXTRA_COMPONENT_DIRS "${PROJECT_DIR}/components/tft")
+project(app-template )

components/tft/CMakeLists.txt

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+idf_component_register(SRCS "comic24.c"
+							"def_small.c"
+							"DefaultFont.c"
+							"DejaVuSans18.c"
+							"DejaVuSans24.c"
+							"minya24.c"
+							"SmallFont.c"
+							"tooney32.c"
+							"Ubuntu16.c"
+                       INCLUDE_DIRS ".")

main/CMakeLists.txt

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+idf_component_register(SRCS "main.cpp"
+							"aero.cpp"
+							"atmosphere.cpp"
+							"bitcount.cpp"
+							"ctrl.cpp"
+							"disp.cpp"
+							"disp_lcd.cpp"
+							"disp_oled.cpp"
+							"format.cpp"
+							"gps.cpp"
+							"hal.cpp"
+							"intmath.cpp"
+							"ldpc.cpp"
+							"log.cpp"
+							"main.cpp"
+							"nmea.cpp"
+							"ognconv.cpp"
+							"proc.cpp"
+							"rf.cpp"
+							"sens.cpp"
+							"st7789.cpp"
+							"timesync.cpp"
+						EMBED_FILES "OGN_logo_240x240.jpg"
+                       INCLUDE_DIRS "."
+					   INCLUDE_DIRS "../components")