安装教程来自以下：

安装ubus：https://segmentfault.com/a/1190000012061795

安装json-c,libubox：https://segmentfault.com/a/1190000012017022

安装ubus之前需要先安装json-c，再安装libubox，最后安装ubus

ubus下载：

git clone git://nbd.name/luci2/ubus.git

json-c下载：

git clone https://github.com/json-c/json-c.git

libubox下载：

git clone http://git.openwrt.org/project/libubox.git

补充:编译安装ubus时可能出现json头文件找不到的问题,因为安装libubox时只生成libblobmsg_json.a静态库没有生成.so文件,可以这样修改:

cmake_minimum_required(VERSION 2.6)
INCLUDE(CheckLibraryExists)
INCLUDE(CheckFunctionExists)

ADD_DEFINITIONS(-DJSONC)
INCLUDE_DIRECTORIES("/usr/local/include/json-c")
INCLUDE_DIRECTORIES("/usr/local/include")
INCLUDE_DIRECTORIES("/usr/local/lib")
SET(CMAKE_INSTALL_PREFIX "/usr/bin/libubox")

PROJECT(ubox C)
ADD_DEFINITIONS(-Os -Wall -Werror --std=gnu99 -g3 -Wmissing-declarations)

OPTION(BUILD_LUA "build Lua plugin" ON)
OPTION(BUILD_EXAMPLES "build examples" ON)

INCLUDE(FindPkgConfig)
PKG_SEARCH_MODULE(JSONC json-c)
IF(JSONC_FOUND)
  ADD_DEFINITIONS(-DJSONC)
  INCLUDE_DIRECTORIES(${JSONC_INCLUDE_DIRS})
ENDIF()

SET(SOURCES avl.c avl-cmp.c blob.c blobmsg.c uloop.c usock.c ustream.c ustream-fd.c vlist.c utils.c safe_list.c runqueue.c md5.c kvlist.c ulog.c base64.c)

ADD_LIBRARY(ubox SHARED ${SOURCES})
ADD_LIBRARY(ubox-static STATIC ${SOURCES})
SET_TARGET_PROPERTIES(ubox-static PROPERTIES OUTPUT_NAME ubox)

SET(LIBS)
CHECK_FUNCTION_EXISTS(clock_gettime HAVE_GETTIME)
IF(NOT HAVE_GETTIME)
        CHECK_LIBRARY_EXISTS(rt clock_gettime "" NEED_GETTIME)
        IF(NEED_GETTIME)
                TARGET_LINK_LIBRARIES(ubox rt)
        ENDIF()
ENDIF()

FILE(GLOB headers *.h)
INSTALL(FILES ${headers}
        DESTINATION include/libubox
)
INSTALL(TARGETS ubox ubox-static
        ARCHIVE DESTINATION lib
        LIBRARY DESTINATION lib
)

#ADD_SUBDIRECTORY(lua)
#ADD_SUBDIRECTORY(examples)

find_library(json NAMES json-c)
IF(EXISTS ${json})
        ADD_LIBRARY(blobmsg_json SHARED blobmsg_json.c)
        TARGET_LINK_LIBRARIES(blobmsg_json ubox ${json})

        ADD_LIBRARY(blobmsg_json-static STATIC blobmsg_json.c)
        SET_TARGET_PROPERTIES(blobmsg_json-static
                              PROPERTIES OUTPUT_NAME blobmsg_json)

        ADD_EXECUTABLE(jshn jshn.c)
        TARGET_LINK_LIBRARIES(jshn blobmsg_json ${json})

        ADD_LIBRARY(json_script SHARED json_script.c)
        TARGET_LINK_LIBRARIES(json_script ubox)


        INSTALL(TARGETS blobmsg_json-static json_script
                ARCHIVE DESTINATION lib
                LIBRARY DESTINATION lib
                RUNTIME DESTINATION bin
                )

        FILE(GLOB scripts sh/*.sh)
        INSTALL(FILES ${scripts}
                DESTINATION share/libubox
        )

ENDIF()

最后将.so文件放进.a的目录下或者放进/usr/lib目录就好