/usr/include/ is in libmagick++-dev 8:6.7.7.10-6ubuntu3.
This file is owned by root:root, with mode 0o755.
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/usr/include/ImageMagick/
/usr/include/ImageMagick/Magick++/
/usr/include/ImageMagick/Magick++/Montage.h
/usr/include/ImageMagick/Magick++/Image.h
/usr/include/ImageMagick/Magick++/STL.h
/usr/include/ImageMagick/Magick++/Pixels.h
/usr/include/ImageMagick/Magick++/Drawable.h
/usr/include/ImageMagick/Magick++/Include.h
/usr/include/ImageMagick/Magick++/CoderInfo.h
/usr/include/ImageMagick/Magick++/Exception.h
/usr/include/ImageMagick/Magick++/TypeMetric.h
/usr/include/ImageMagick/Magick++/Geometry.h
/usr/include/ImageMagick/Magick++/Blob.h
/usr/include/ImageMagick/Magick++/Color.h
/usr/include/ImageMagick/Magick++.h