OpenCV/NDK - zlib compiling issues in android makefile -

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i have been trying compile shared library includes opencv libraries. sample android make files below:

local_path := (call my-dir) include $(clear_vars) local_module := libopencvxxx local_src_files := libs/opencv/libopencvxxx.a include $(prebuilt_static_library)  opencv_lib_type := static opencv_install_modules := on opencv_camera_modules := on  local_module := libxxx local_cppflags := -std=c++11 -fexceptions local_cpp_features += exceptions local_cflags := -std=gnu++11 -fexceptions local_ldlibs := -llog -ldl  local_src_files := xxx.cpp local_c_includes := <path opencv header files>  local_static_libraries := stdc++ local_static_libraries += libopencvxxx  include $(build_shared_library)

however, keeps throwing below errors:

[info] jni/libs/opencv/libopencv_core.a(persistence.cpp.o):persistence.cpp:function icvgets(cvfilestorage*, char*, int): error: undefined reference 'gzgets' [info] jni/libs/opencv/libopencv_core.a(persistence.cpp.o):persistence.cpp:function icvxmlskipspaces(cvfilestorage*, char*, int): error: undefined reference 'gzeof'

i tried several options below.

local_ldlibs += -lz local_ldlibs += -l<ndk root>/platforms/android-19/arch-arm/usr/lib -lz

but nothing helped. has clue how can fix this?

edit: forgot add when add these above 2 options including '-lz', throws error saying "no native compiled library found, did native compile complete successfully!".

i found issue. supposed add

include $(clear_vars)

after including static libraries. below corrected android.mk

local_path := (call my-dir) include $(clear_vars) local_module := libopencvxxx local_src_files := libs/opencv/libopencvxxx.a include $(prebuilt_static_library)  include $(clear_vars)  opencv_lib_type := static opencv_install_modules := on opencv_camera_modules := on  local_module := libxxx local_cppflags := -std=c++11 -fexceptions local_cpp_features += exceptions local_cflags := -std=gnu++11 -fexceptions local_ldlibs := -llog -ldl  local_src_files := xxx.cpp local_c_includes := <path opencv header files>  local_static_libraries := stdc++ local_static_libraries += libopencvxxx  include $(build_shared_library)

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