Am I getting the correct version of Qt?

mzimmers

Hi -

I'm still trying to master the installation and administration of Qt. I've been playing around a little, and I'm not sure I'm getting the right version of Qt from the command line.

From a directory containing one file (hello.cpp) I issue the qmake -install command, and get a makefile. The header gives me reason for concern:

#############################################################################
# Makefile for building: hello
# Generated by qmake (2.01a) (Qt 4.8.6) on: Tue Feb 28 08:41:23 2017
# Project:  hello.pro
# Template: app
# Command: /usr/lib/x86_64-linux-gnu/qt4/bin/qmake -o Makefile hello.pro
#############################################################################

Qt4? I just installed this a couple weeks ago. I'm sure I have Qt5 on my system.

In my earlier experimentation, I had a few false starts with Qt. Is there some way to to a master cleanup of Qt to eradicate any old stuff? I've run the maintenance tool, and that hasn't solved this issue.

Thanks.

SGaist

Hi,

You are likely calling your distribution provided Qt.

Always use the full path of the one you intend to use.

mzimmers

Hi Rgaist -

I'm not sure I know what you mean by "distribution provided," but yes, I'm finding my way to the wrong qmake.

mzimmers@debian:~/QtStuff/hello$ which qmake
/usr/bin/qmake
mzimmers@debian:~/QtStuff/hello$

The qmake I want is in /opt/Qt/5.8/gcc_64/bin/.

I looked in /usr/bin, and there's a bunch of Qt stuff in there. I never specified /usr/bin as an install location, so I'm not sure how it all got there. Are these files even necessary? I'm the only user on this system.

Thanks...

SGaist

That's the standard path for your distribution Qt installation.

Don't worry about that, that's 100% fine.

Therefore my recommendation: when your using a terminal, just use the full path to the qmake version you want to use. That way you ensure that you are calling the one you need/want.

mrjj

@mzimmers
Hi
For ubuntu I had to do
http://askubuntu.com/questions/820054/selecting-qt5-using-qtchooser
Not sure it applies to a pure debian :)
https://packages.debian.org/jessie/qtchooser

Also , for Mint 18, i had to use
https://packages.debian.org/jessie/qt5-default

mzimmers

@SGaist do I correctly understand that the standard Debian installation includes a version of Qt?

And I surmise that it's probably better if I don't go into /usr/bin and try to clean it up myself, right?

Hi, mrjj - I saw the chooser and was thinking about using it. I'll report back on how it works with Debian if I find anything wrong.

Thanks...

SGaist

Debian provides both Qt 4 and Qt 5 but AFAIK, the default is still Qt 4.

Indeed, don't go there moving stuff around, there's nothing to clean. You'll just break your co-worker setup.

mrjj

@mzimmers
Hi
well something like
qtchooser -list-versions
is not dangerous :)