Github user jcrist commented on the issue:
https://github.com/apache/orc/pull/192
As an example, in a downstream c++ project I'm building `liborc.a` using
the following `ExternalProject` setup:
```python
set (ORC_CMAKE_ARGS -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
-DCMAKE_INSTALL_PREFIX=${ORC_PREFIX}
-DBUILD_LIBHDFSPP=OFF
-DBUILD_JAVA=OFF
-DBUILD_TOOLS=OFF
-DBUILD_CPP_TESTS=OFF
-DPROTOBUF_HOME=${PROTOBUF_HOME}
-DLZ4_HOME=${LZ4_HOME}
-DSNAPPY_HOME=${SNAPPY_HOME}
-DZLIB_HOME=${ZLIB_HOME})
ExternalProject_Add(orc_ep
GIT_REPOSITORY "https://github.com/apache/orc";
GIT_TAG ${ORC_VERSION}
BUILD_BYPRODUCTS ${ORC_STATIC_LIB}
CMAKE_ARGS ${ORC_CMAKE_ARGS})
```
where `protobuf`, `lz4`, `snappy`, and `zlib` are all already existing
dependencies.
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