Build depend on QT5, as libvtk6-qt-dev is pulling that one in anyway.
libpcl-dev needs libvtk6-qt-dev to compile stuff.
libvtk6-dev,
libqhull-dev,
libopenni-dev [amd64 arm64 armel armhf i386 mips mipsel powerpc ppc64el],
- libqt4-opengl-dev,
+ libqt5opengl5-dev,
libusb-1.0-0-dev,
freeglut3-dev,
libxmu-dev,
libflann-dev,
libvtk6-dev,
libqhull-dev,
+ libvtk6-qt-dev [!armel !armhf],
libopenni-dev [amd64 arm64 armel armhf i386 mips mipsel powerpc ppc64el],
libpcl1.7 (= ${binary:Version}),
${misc:Depends}