This repo uses one CMakeLists file to compile cross-platform static libs
You must setup ANDROID_NDK environment variable in your ~/.bashrc file to point to your NDK directory.
At first:
cd Box2D
./build_android.sh
Change the following line to match your own iOS SDK version
IOS_SDK_VERSION="7.1"
./build_iosmac.sh
./build_linux.sh
Generate VS project file from CMakeLists.txt
Compile the static library.