ABOUT:
ZRT - ZeroVM Run-Time environment for user executables running on virtual hardware represented by ZeroVM.
ZRT acts as an operating system for user executable and is implemented as libzrt.a static library
NEXE is a user executable that was produced by nacl_gcc or nacl_g++ (part of Native Client SDK)

INSTALL & RUN
1. Install ZeroVM, Consult http://github.com/zerovm/zerovm/blob/master/README
2. Install NaCl SDK. Consult https://developers.google.com/native-client/sdk/download for exact procedure. 
Below should work okay in most cases.

cd ~
wget http://commondatastorage.googleapis.com/nativeclient-mirror/nacl/nacl_sdk/nacl_sdk.zip 
unzip nacl_sdk.zip 
cd nacl_sdk 
./naclsdk list
./naclsdk update --force pepper_21

3. Install zrt

git clone https://github.com/zerovm/zrt.git

4.Set environmant variables on ~/.bashrc

NACL_SDK_ROOT NaCl pepper path
ZEROVM_ROOT root of ZeroVM 
ZRT_ROOT root of ZRT
ZPYTHON_ROOT root of cpython ported to ZRT

For example:

export NACL_SDK_ROOT=${HOME}/nacl_sdk/pepper_21
export ZEROVM_ROOT=${HOME}/zerovm
export ZRT_ROOT=${HOME}/zrt
export ZPYTHON_ROOT=${HOME}/zpython

5. Fix the validator config and binpatch

ln -s ${NACL_SDK_ROOT}/tools/ncval_x86_64 /usr/local/bin/ncval
sed -i 's#BINPATCH=binpatch#BINPATCH=/bin/true#' ${ZRT_ROOT}/Makefile.env

6. run

cd ${ZRT_ROOT}
make
make all_samples
make zrt_tests


DOCS
zrt/README
zrt/zvm/README
zrt/lib/README
zrt/lib/lua-5.2.1/README
zrt/lib/sqlite3/README
zrt/lib/networking/README
zrt/lib/mapreduce/README
zrt/tests/README
zrt/tests/lua_test_suite/README
zrt/samples/README