title: Android PJSIP ndk-build issue No such file or directory
body: <p>I am developing android app using PJSIP. I have successfully installed required     softwares and executed almost all the commands given in PJSIP android - getting started page. But I got stuck while executing command "ndk-build". 
  I followed the below link:
  "<a href="http://trac.pjsip.org/repos/wiki/Getting-Started/Android" rel="nofollow">http://trac.pjsip.org/repos/wiki/Getting-Started/Android</a>"
  It is giving following error. (Platform used: Windows + Cygwin)</p>
  
  <pre><code>$ ndk-build
  Invoking SWIG...
  swig -c++ -o jni/pjsua_wrap.cpp -package org.pjsip.pjsua -outdir src/org/pjsip/p
  jsua -java jni/pjsua.i
  Compile++ thumb  : pjsua &lt;= pjsua_wrap.cpp
  In file included from jni/../../pjsua_app.h:27:0,
                   from jni/pjsua_wrap.cpp:414:
  jni/../../pjsua_app_common.h:22:29: fatal error: pjsua-lib/pjsua.h: No such file
   or directory
  compilation terminated.
  /cygdrive/d/Softwares/android-ndk-r8e/build/core/build-binary.mk:272: recipe for
   target `obj/local/armeabi/objs/pjsua/pjsua_wrap.o' failed
  make: *** [obj/local/armeabi/objs/pjsua/pjsua_wrap.o] Error 1
  </code></pre>
  
  <p>I think, problem is with path as pjsua.h is not present in pjsua-lib folder.
  But I have tried almost all paths, but no luck. 
  Any help related to this will be appreciated. </p>