We use cmake to build, emsdk comes with a cmake toolchain.. mine is at /Users/xnor/local/src/emsdk//upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake so I can build with cmake via:
mkdir build && cd build && CMAKE_TOOLCHAIN_FILE=/Users/xnor/local/src/emsdk//upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake cmake ..
For installing in the test directory to debug in chrome
mkdir build && cd build
CMAKE_TOOLCHAIN_FILE=/Users/xnor/local/src/emsdk//upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake \
cmake .. -DCMAKE_INSTALL_PREFIX=~/dev/rnbo.core/src/js/test/static/ \
-DCMAKE_BUILD_TYPE=Debug \
-DRNBO_CLASS_FILE=/Users/xnor/Documents/export/cycle-mod/rnbo_source.cpp \
-DRNBO_DESCRIPTION_FILE=/Users/xnor/Documents/export/cycle-mod/description.json
cmake --build . && cmake --install .