title: Error with building Android NDK Project
body: <p>I wand build project in windows, I get same Errors:</p>
  
  <pre><code>   bash C:\linux\android-ndk1\ndk-build V=1 
      cygwin warning:
        MS-DOS style path detected: C:\dev\android\workspace4_android\FFWall
        Preferred POSIX equivalent is: /cygdrive/c/dev/android/workspace4_android/FFWall
        CYGWIN environment variable option "nodosfilewarning" turns off this warning.
        Consult the user's guide for more details about POSIX paths:
          http://cygwin.com/cygwin-ug-net/using.html#using-pathnames
      Android NDK: ERROR:jni/Android.mk:bambuser-libavcore: LOCAL_SRC_FILES points to a missing file    
      /cygdrive/c/linux/android-ndk1/build/core/prebuilt-library.mk:43: *** Android NDK: Aborting    .  Stop.
      Android NDK: Check that jni/ffmpeg-android/build/ffmpeg/armeabi/lib/libavcore.so exists  or that its path is correct   
  </code></pre>
  
  <p>Another way building:</p>
  
  <pre><code>C:\art\android-ndk\ndk-build V=1 
  
  Cannot run program "C:\art\android-ndk\ndk-build": Launching failed
  Error: Program "C:/art/android-ndk/ndk-build" is not found in PATH
  
  PATH=[C:\Art\android-ndk;C:/Program Files/Java/jre7/bin/client;C:/Program Files/Java/jre7/bin;C:/Program Files/Java/jre7/lib/i386;C:\Program Files\PC Connectivity Solution\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\MATLAB\R2011a\runtime\win32;C:\Program Files\MATLAB\R2011a\bin;C:\Program Files\MATLAB\R2007b\bin;C:\Program Files\MATLAB\R2007b\bin\win3;C:\dev\android\android-sdk-windows\tools;C:\cygwin\bin;C:/art/android-ndk/;C:\linux\android-ndk-r7b;C:\dev\android\eclipse] 
  </code></pre>
  
  <p>Why this happened?</p>