Important: Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct
Problems with libQtOpenGL.so.4.8.7
I've been working on modifications for several linux programs; working on Linux Mint 18.2.
A number of programs, including Okular, Octave and FreeCad, give me the same error when I try to run them. I haven't changed these programs at all, but I have added qt version 5 to my machine. The particular error in all three is:
symbol lookup error: /usr/lib/x86_64-linux-gnu/libQtOpenGL.so.4: undefined symbol: _ZNK14QWidgetPrivate17hasHeightForWidthEv
libQtOpenGL.so.4 is merely a symlink to libQtOpenGL.so.4.8.7, in the same folder.
I've checked both libraries with readelf -Ws and nm -D, and both commands show that symbol as present.
I also have Qt 4.4 and Qt5.5 in other directories, but these all have that symbol defined.
Any clues on how to resolve this?
Hi and welcome to devnet,
How did you install both versions of Qt ?
Qt4 was included with the Linux Mint 18.2 when I installed it. I added Qt5 by downloading qt-opensource-linux-x64 from the qt.io archive site. Not sure, but I think the problems began occurring after I installed Qt5
And where does your Qt 4.4 come from ?
also from the qt.io archive site
Qt 4.8.7 being already outdated and having reached end of life, why are you using Qt 4.4 ?
Why are all three versions now having this same problem, and why did this problem show up after I installed the latest stable version (at the time).?
I don't know. What I would do is to remove all non-system versions you install and check if you still have that problem.