<commit_before># REAL Core
REAL Core is REnju AnaLysis Core libraries.

## Requirements
* git lfs 1.5.6 or newer
* Google Test 1.8.0 or newer
* CMake 3.7.2 or newer
* ccache 3.3.4 or newer(optional)

## Environment variables
Some shell scripts and CMake require the following environment variables:
* REALCORE_DIR:  the top directory path of the REAL Core
* GTEST_DIR: the top directory of the Google Test
* MAKE_JOB_NUMBER: the number of jobs to compile C++ files simultaneously

<commit_msg>Modify the environment variable section in README.md<commit_after># REAL Core
REAL Core is REnju AnaLysis Core libraries.

## Requirements
* git lfs 1.5.6 or newer
* Google Test 1.8.0 or newer
* CMake 3.7.2 or newer
* ccache 3.3.4 or newer(optional)

## Environment variables
Some shell scripts and CMake require the following environment variables:
* REALCORE_DIR:  the top directory of the REAL Core
* GTEST_DIR: the top directory of the Google Test
* MAKE_JOB_NUMBER: the number of jobs to compile C++ files simultaneously


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