Building the libotr3.js 

1. [Setup Emscripten + LLVM clang compilers](https://github.com/kripken/emscripten/wiki/Tutorial)
    
2. [Setup crypto-emscripten build script](https://github.com/mnaamani/crypto-emscripten). 
This will be used to compile libgpg-error,libgcrypt and libotr into bitcode.
    
In the root directory of crypto-emscripten folder, edit **build-libs.sh** and set *LIBOTR_VERSION* to *"3.2.1"*.

Then run the build script.

    ./build-libs.sh
    export CRYPTO_EMSCRIPTEN=`pwd`

3. Get the source of otr3-em and make the module.

    git clone https://github.com/mnaamani/otr3-em.git
    cd otr3-em/

Either run:
 
    make -e     #this will use the environement variable exported in step 2 to locate crypto-emscripten

..or 

    make CRYPTO_EMSCRIPTEN=/path/to/crypto-emscripten


4. Run a test

    node test