add_subdirectory(sqlite3/sqlite-3430000)
add_subdirectory(goahead-5.2.0)

# ================= httpserver ================= #
# Do not delete this module, it is just disabled for compilation because it is not used.
# 不要删掉该模块，此处只是因为未使用而屏蔽掉编译。
# find_program(M4 m4)
# if(NOT M4)
#   message("m4 not found. Install before continuing.")
#   execute_process(COMMAND sudo apt-get install m4
#                   WORKING_DIRECTORY ${EXTERNAL_SOURCE_PATH}/)
# endif()
# find_program(RAGEL ragel)
# if(NOT RAGEL)
#   message("ragel not found. Now install.")
#   execute_process(COMMAND sudo apt-get install ragel
#                   WORKING_DIRECTORY ${EXTERNAL_SOURCE_PATH}/)
# endif()
# add_subdirectory(httpserver.h-master/src)
# ================= httpserver end ================= #

add_subdirectory(cJSON-1.7.17)
add_subdirectory(libhv/libhv-1.3.2)
# ================= ffmpeg related ================= #
add_subdirectory(ffmpeg)
add_subdirectory(fdk-aac)
# ================= ffmpeg related end ================= #
add_subdirectory(libconfig)
add_subdirectory(libfaac)