android - make: *** No targets specified and no makefile found. Stop -


this question duplicate make *** no targets specified , no makefile found. stop problem different , tried solution not work me.
i'm working on opencv library , start sample project gives following error me. please me solve error. 

17:31:25 **** auto build of configuration default project myfirstopencvjni **** make  make: *** no targets specified , no makefile found.  stop.  17:31:25 build finished (took 122ms)

following android.mk file
//android.mk 

local_path := $(call my-dir)  include $(clear_vars)  opencv_lib_type:=static opencv_install_modules:=on  include ../includeopencv.mk include $(opencv_mk_path)  local_module    := first-opencvjni local_src_files := first-opencvjni.cpp local_ldlibs +=  -llog -ldl  include $(build_shared_library)

after many searches solved error, right click on project->properties->c/c++ build(left side)->builder settings->uncheck "use default build command" checkbox->enter "${ndkroot}/ndk-build.cmd" in build command checkbox on windows os, see following image enter image description here

before doing thing need set ndkroot environment variable in environment settings root folder ndk directory in case c:\adt-bundle-windows-x86-20130522\android-ndk-r8e.
if difficulties or queries let me know.


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