How to compile latest OpenCV with OpenNI 1.5.4.0?

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I am trying to compile the latest OpenCV from the master branch with OpenNI support. Here is what I tried:

cmake -DOPENNI_LIB_DIR=/opt/openni-1.5.4.0/Lib -DOPENNI_INCLUDE_DIR=/opt/openni-1.5.4.0/Include -DWITH_OPENNI=on ..

However, this results in the following warning:

WARNING, OpenNI include directory (set by OPENNI_INCLUDE_DIR variable) is not found or does not have OpenNI include files.

Setting the variables OPENNI_LIB and OPENNI_INCLUDES directly did not help either.