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I just installed CGAL from ubuntu 16.04 package manger and tried to run an example according to this: http://www.cgal.org/FAQ.html#debian_demos

after runing, the following message appeared: NOTICE: This demo requires CGAL and Qt5, and will not be compiled.

But the following packages are already installed:

Package , Installed version

libcgal-demo , 4.7-4

libcgal-dev , 4.7-4

libcgal-ipelets , 4.7-4

libcgal-qt5-11 , 4.7-4

libcgal-qt5-dev , 4.7-4

libcgal-11v5 , 4.7-4

cmake , 3.5.1-1ubuntu1

cmake-data , 3.5.1-1ubuntu1

g++ , 4:5.3.1-1ubuntu1

I'm wondering what is the problem?

user252935
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    http://doc.cgal.org/latest/Manual/installation.html#thirdpartyQt says you may need many components of Qt (Core, Gui, etc). Do you have all of them? – Marc Glisse May 03 '16 at 07:14

1 Answers1

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Try installing the following packages: qtscript5-dev, libqt5opengl5-dev, libqt5svg5-dev or alternatively try to find demo that is not compiling and change the line in CMakeLists.txt containing 

find_package(Qt5 QUIET COMPONENTS Xml Script OpenGL Svg)

into:

find_package(Qt5 COMPONENTS Xml Script OpenGL Svg)

This will allow you to track the necessary packages (you are probably missing different packages than me).

Grzegorz
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    Outstanding answer. The error reported led me straight to `$ sudo apt-get install libqt5svg5-dev`, and that removed the `NOTICE: This demo requires CGAL and Qt5, and will not be compiled.` – sancho.s ReinstateMonicaCellio Mar 01 '19 at 12:20