I can reproduce this issue even with the playground project:
/Users/dburks/Library/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: error: cannot find -lc++
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [libvolla-launcher.so] Error 1
Building and deploying apps for Android work fine with the standard Qt Creator, but not with the Felgo SDK.