qmake: could not find a Qt installation of '&#

问题:

I have a software in ubuntu that requires me to run qmake to generate the Makefile.

However, running qmake gives back this error,

qmake: could not find a Qt installation of ''

I have installed what I thought to be the required packages using,

sudo apt-get install qt4-qmake
sudo apt-get install qt5-qmake

But the error didn't go away.

Any help on this would be gladly appreciated!

回答1:

sudo apt-get install qt5-default works for me.

$ aptitude show qt5-default

tells that

This package sets Qt 5 to be the default Qt version to be used when using development binaries like qmake. It provides a default configuration for qtchooser, but does not prevent alternative Qt installations from being used.

回答2:

You could check path to qmake using which qmake.

Consider install qt4-default or qt5-default depends what version of qt you want use.

You could also use qtchooser - a wrapper used to select between Qt development binary versions.

回答3:

For others in my situation, the solution was:

qmake -qt=qt5

This was on Ubuntu 14.04 after install qt5-qmake. qmake was a symlink to qtchooser which takes the -qt argument.

回答4:

As Debian Qt's maintainer please allow me to suggest you to not use qtx-default. Please read qtchooser's man page, the solution is described there. If you are interested in packaging an app you can also take a look at this blog post I made explaining how to do it

回答5:

I had this problem building jasmine-headless-webkit Ruby gem. Despite having qt4 installed, qmake (a symlink to qtchooser) insisted it didn't know about a QT installation. OTOH, it was able to list qt4 when asked directly.

This made everything better:

export QT_SELECT=qt4

qtchooser then knew to use qmake-qt4, and so on.

回答6:

Search where is qmake-qt4:

which qmake-qt4

For example qmake-qt4 is in this path:

/usr/bin/qmake-qt4

Create symbolic link:

cd /usr/local/sbin/
ln -s /usr/bin/qmake-qt4 .
mv qmake-qt4 qmake

Regards

回答7:

I have qt4 installed. I found that using the following path worked for me, despite 'which qmake' returning /usr/bin/qmake, which is just a link to qtchooser anyway.

The following path works for me, on a 64 bit system. Running from the full path of:

/usr/lib/x86_64-linux-gnu/qt4/bin/qmake

回答8:

A symbolic link to the desired version, defined globally:

sudo ln -s /usr/bin/qmake-qt5 /usr/bin/qmake

... or per user:

sudo ln -s /usr/bin/qmake-qt5 /home/USERNAME/.local/bin/qmake

... to see if it works:

qmake --version