Some actual english explaining your problem would be great.

I understand that some of the file does not exist, but the downloaded files but could not find the required files

Try installing python. According to the output you don't have it or its not correctly set in your environment variables.

CRITICAL root: you can fall back to the older (pre-fastcomp) compiler core, although that is not recommended, see https://github.com/kripken/emscripten/wiki/LLVM-Backend
INFO root: (Emscripten: Running sanity checks)
CRITICAL root: failing sanity checks due to previous fastcomp failure
CRITICAL root: failing sanity checks due to previous fastcomp failure
make: *** [compiledict.o] Error 1
make: *** Waiting for unfinished jobs....
make: *** [speak.o] Error 1
mv: rename speak to speak.bc: No such file or directory
emscripten

CRITICAL root: fastcomp in use, but LLVM has not been built with the JavaScript backend as a target, llc reports:

LLVM (http://llvm.org/):
LLVM version 3.3
Optimized build.
Default target: x86_64-apple-darwin13.3.0
Host CPU: core-avx-i

Registered Targets:
aarch64 - AArch64
arm - ARM
cpp - C++ backend
hexagon - Hexagon
mblaze - MBlaze
mips - Mips
mips64 - Mips64 [experimental]
mips64el - Mips64el [experimental]
mipsel - Mipsel
msp430 - MSP430 [experimental]
nvptx - NVIDIA PTX 32-bit
nvptx64 - NVIDIA PTX 64-bit
ppc32 - PowerPC 32
ppc64 - PowerPC 64
sparc - Sparc
sparcv9 - Sparc V9
systemz - SystemZ
thumb - Thumb
x86 - 32-bit X86: Pentium-Pro and above
x86-64 - 64-bit X86: EM64T and AMD64

xcore - XCore

CRITICAL root: you can fall back to the older (pre-fastcomp) compiler core, although that is not recommended, see https://github.com/kripken/emscripten/wiki/LLVM-Backend
INFO root: (Emscripten: Running sanity checks)
CRITICAL root: failing sanity checks due to previous fastcomp failure
cat: speak.raw.js: No such file or directory