To build the libjnvpx library:

Configure the sources with
./configure --disable-examples --disable-debug --disable-md5 --disable-shared \
	--enable-vp8 --enable-realtime-only --enable-error-concealment 
	
For linux and MAC OS X add --enable-pic
and a suitable target: 
    --target=universal-darwin9-gcc
    --target=x86-linux-gcc
    --target=x86_64-linux-gcc

If there are errors while linking on linux x86_64 try to add --extra-cflags='-fvisibility=protected'


Run the 'libvpx' ant target from the libjitsi/ directory, setting the 'libvpx'
property.