baresip | modular SIP User-Agent with audio and video support | TCP library

I want to implement baresip lib into my Android project using NDK.

I've found up-to-date "bare bones" demo-project in HERE. As in readme I've created some native libs from another repo and placed in "distribution" folder. Project is compiling, installing, working fine. Comparing to Android native sip implementation this lib is just awesome, use it, forget about permission.USE_SIP, its rubish.

Now I want to import baresip into my project, but without Java/Kotlin files, planning to build own. So my steps:

1. Added externalNativeBuild entries to build.gradle
2. Copied cpp and distribution folders to proper places in my structure
3. Invalidate cache and restart

And got exception:

Build command failed.

Error while executing process C:\Android\sdk\cmake\3.6.4111459\bin\cmake.exe with arguments {--build C:\Android\projects\MyApplication\app.cxx\cmake\debug\armeabi-v7a --target baresip}

[1/2] Building C object CMakeFiles/baresip.dir/baresip.c.o

[2/2] Linking C shared library C:\Android\projects\MyApplication\app\build\intermediates\cmake\debug\obj\armeabi-v7a\libbaresip.so

FAILED: cmd.exe /C "..."

next some duplicated lines like:

src/video.c:331: error: undefined reference to 'atof'

src/main/main.c:944: error: undefined reference to 'signal'

src/main/main.c:775: error: undefined reference to '__FD_ISSET_chk'

src/main/main.c:690: error: undefined reference to '__FD_SET_chk'

C:/Android/projects/MyApplication/app/src/main/cpp/../../../../distribution/openssl/lib/armeabi-v7a/libcrypto.a(armcap.o):armcap.c:function OPENSSL_cpuid_setup: error: undefined reference to 'sigfillset'

and ends with

clang: error: linker command failed with exit code 1 (use -v to see invocation)

ninja: build stopped: subcommand failed.

note app/src/main/cpp/../../../../distribution/ files path, as declared in CMakeLists:

I am trying to develop an application which provides Audio and Video calling, Now I am following baresip library for the same.

and I wrote following code on button Click :