Fail to build android apk in vcmi develop branch

When I checkout ext/vcmi to master branch, everything is OK. But I checkout ext/vcmi to develop branch, and type:

python build.py fixpaths build-cmake

Error occured:

PS E:\code\vcmi-android> python build.py fixpaths build-cmake
Didn’t fix anything in ./project/gradle.properties (already fixed?)
Didn’t fix anything in ./ext/boost/boost_1_68_0/boost/thread/pthread/mutex.hpp (already fixed?)
Didn’t fix anything in ./ext/boost/boost_1_68_0/boost/thread/pthread/recursive_mutex.hpp (already fixed?)
Didn’t fix anything in ./ext/boost/boost_1_68_0/libs/filesystem/src/operations.cpp (already fixed?)
Didn’t fix anything in ./ext/boost/boost_1_68_0/boost/asio/detail/impl/epoll_reactor.ipp (already fixed?)
File ./ext/SDL2/SDL2-image/code/Android.mk not found; skipping
File ./ext/SDL2/SDL2-ttf/code/Android.mk not found; skipping
File ./ext/SDL2/SDL2-mixer/code/Android.mk not found; skipping
File ./ext/SDL2/SDL2-mixer/code/external/smpeg2-2.0.0/Android.mk not found; skipping
Didn’t fix anything in ./ext/ff/ffmpeg/configure (already fixed?)
Didn’t fix anything in ./ext/ff/x264/configure (already fixed?)
Didn’t fix anything in ./ext/vcmi/AI/FuzzyLite/fuzzylite/CMakeLists.txt (already fixed?)

Task :vcmi-app:configureCMakeRelWithDebInfo FAILED

FAILURE: Build failed with an exception.

  • What went wrong:
    Execution failed for task ‘:vcmi-app:configureCMakeRelWithDebInfo’.
    C/C++: E:\code\vcmi-android\project\vcmi-app\cmake-scripts\CMakeLists.txt VcmiOnlyRelease|arm64-v8a : CMake Error at E:/code/vcmi-android/ext/vcmi/lib/CMakeLists.txt:1 (add_main_lib):
    Unknown CMake command “add_main_lib”.

  • Try:
    Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

  • Get more help at https://help.gradle.org

BUILD FAILED in 4s
14 actionable tasks: 14 executed
Error code 1 during build on command: gradlew -a :vcmi-app:compileLibsOnlyReleaseSources

I dont know how to fix it.

My build scan is Build Scan™ | Gradle Cloud Services

See my latest PR to Android

Which version of Android SDK and NDK should I use?