Expected behavior

When compiling POCO with Android QT app, I get errors:
src/Socket.cpp:305: error: undefined reference to '__FD_SET_chk'
src/Socket.cpp:316: error: undefined reference to '__FD_SET_chk'
src/Socket.cpp:327: error: undefined reference to '__FD_SET_chk'
src/Socket.cpp:359: error: undefined reference to '__FD_ISSET_chk'
src/Socket.cpp:370: error: undefined reference to '__FD_ISSET_chk'
src/Socket.cpp:381: error: undefined reference to '__FD_ISSET_chk'
src/SocketImpl.cpp:718: error: undefined reference to '__FD_SET_chk'
src/Mutex_POSIX.cpp:128: error: undefined reference to 'pthread_mutex_timedlock'
src/Thread_POSIX.cpp:43: error: undefined reference to 'sigemptyset'
src/Thread_POSIX.cpp:44: error: undefined reference to 'sigaddset'
src/Thread_POSIX.cpp:331: error: undefined reference to 'sigemptyset'
src/Thread_POSIX.cpp:332: error: undefined reference to 'sigaddset'
src/Thread_POSIX.cpp:333: error: undefined reference to 'sigaddset'
src/Thread_POSIX.cpp:334: error: undefined reference to 'sigaddset'

Actual behavior

Toolchain for POCO build as
$ndk_path/Android/android-ndk-r17b/build/tools/make-standalone-toolchain.sh --arch=arm --platform=android-21 --install-dir=$poco_toolchain_path

Poco configure an build as static
./configure --config=Android --no-samples --no-tests --static
make -s -j3 CXXFLAGS='-std=c++11' ANDROID_ABI=armeabi-v7a

Steps to reproduce the problem

Simple example of httprest server
PocoAndroidTest.zip

POCO version

1.9.1

Compiler and version

Android NDK r17b GCC 4.9

Operating system and version

Ubuntu 16.04 x64