1 emscripten-1.37.5
2 emscripten-fastcomp-1.37.5
3 emscripten-fastcomp-clang-1.37.5 already move it into emscripten-fastcomp-1.37.5/tools/clang

then
cd spreak.js/src
./emscripten.sh
.....

1 warning generated.
/home/git/emscripten-1.37.5/em++ -L/usr/local/lib -L/usr/local/BerkeleyDB.4.8/lib/ -o speak speak.o compiledict.o dictionary.o intonation.o readclause.o setlengths.o numbers.o synth_mbrola.o synthdata.o synthesize.o translate.o mbrowrap.o tr_languages.o voices.o wavegen.o phonemelist.o klatt.o sonic.o -lstdc++ -lpthread
emscripten
error: Linking globals named 'wcschr': symbol multiply defined!
Traceback (most recent call last):
File "/home/git/emscripten-1.37.5/emcc", line 13, in
emcc.run()
File "/home/git/emscripten-1.37.5/emcc.py", line 1637, in run
final = shared.Building.llvm_opt(final, link_opts, DEFAULT_FINAL)
File "/home/git/emscripten-1.37.5/tools/shared.py", line 1838, in llvm_opt
assert os.path.exists(target), 'Failed to run llvm optimizations: ' + output
AssertionError: Failed to run llvm optimizations:

anybody help me!!!