How to build docs for opencv-3.0.0-rc1 [closed]

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I built opencv-3.0.0-rc1 on my "Ubuntu 14.04.2 LTS" system (Linux lyta4 3.13.0-49-generic #81-Ubuntu SMP Tue Mar 24 19:29:48 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux) using these commands:

VERS=opencv-3.0.0-rc1
DIR=/home/dave/maclearn/vision/opencv/$VERS
rm -rf $DIR
unzip $VERS.zip
cd $DIR
mkdir build
cd build
cmake -D CMAKE_INSTALL_PREFIX=/usr/local/$VERS \
    -D WITH_TBB=ON -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON \
    -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_DOCS=ON \
    -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_OPENGL=ON -D WITH_IPP=OFF ..
cd $DIR/build
make
make docs

However, apparently the docs were not made. Previously I used the same script to build opencv-3.0.0-beta, and the docs, including several PDF files, were built successfully. It looks like there were changes between opencv-3.0.0-beta and opencv-3.0.0-rc1 in how the docs are built.

In the "General configuration for OpenCV 3.0.0-beta" section of my build log for opencv-3.0.0-beta I see:

--   Documentation:
--     Build Documentation:         YES
--     Sphinx:                      /usr/bin/sphinx-build (ver 1.2.2)
--     PdfLaTeX compiler:           /usr/bin/pdflatex
--     PlantUML:                    NO
--     Doxygen:                     YES (/usr/bin/doxygen)

In the "General configuration for OpenCV 3.0.0-rc1" section of my build log for OpenCV 3.0.0-rc1 I see:

--   Documentation:
--     Doxygen:                     /usr/bin/doxygen (ver 1.8.6)
--     PlantUML:                    NO

Any ideas on how I can build the docs for OpenCV 3.0.0-rc1?

Thanks.