title: how to build libjpeg for ndk use
body: <p>I download libjpeg-8d source code. I want to compile it to libjpeg.so which could be used in android ndk. Because ndk use arm architecture, but the gcc of my PC is x86 architecture. So when I use gcc to compile out libjpeg.so and put it into jni folder. It shows file format can not recorgnize when use ndk-build. So how to build correct libjpeg.so for ndk?</p>