Hi,
I have worked on linphone-android and I am familiar linphone build process inside out. I have removed amr and added opencore-mp3 decoder module for my project. I also have done a lot of changes in mediastreamer code as well.
If I am awarded the bid, I will install a fresh virtual machine and send you every command I type.
I remember we had to setup a lot of libraries like libtools etc for a successful build.
Please ping if you are interested.
Amit