I bump in to the following error during build and not sure how to move forward.
jni//zrtp4pj/android_toolchain/../sources/zsrtp/zrtp/zrtp/ZIDCacheFile.cpp: In member function 'void ZIDCacheFile::checkDoMigration(char*)':
jni//zrtp4pj/android_toolchain/../sources/zsrtp/zrtp/zrtp/ZIDCacheFile.cpp:98:13: error: 'unlink' was not declared in this scope
make[1]: *** [obj/local/armeabi/objs/zrtp4pj/zrtp/zrtp/ZIDCacheFile.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory `/Users/cheefoong/Projects/CSipSimple'
make: *** [libraries] Error 2