Update readme to illustrate proper use of with build_ext

Change-Id: I3cd25f900a50ac7bc4d8ff56b15823dbf22b97c9
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Wes McKinney committed 2016-11-02 12:24:17 -04:00
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@@ -61,7 +61,13 @@ To pass through other build options to CMake, set the environment variable
#### Build the pyarrow Parquet file extension
To build the integration with [parquet-cpp][1], pass `--with-parquet` to
setup.py or add `-DPYARROW_BUILD_PARQUET=on` to the general CMake options.
the `build_ext` option in setup.py:
```
python setup.py build_ext --with-parquet install
```
Alternately, add `-DPYARROW_BUILD_PARQUET=on` to the general CMake options.
```
export PYARROW_CMAKE_OPTIONS=-DPYARROW_BUILD_PARQUET=on