I have a written a small qt app that I use qmake to build, but I am missing the make install target.
How to configure qmake so my binary is copied to /usr/local/bin/ when I run "make install"?
qmake
make
make install
What do I need to add to my .pro file to get the "install" target and how do I control what file and path will be used?
Btw the install will be on Linux pc:s like Debian and Ubuntu.
Add something like this to you .pro file
target.path = /usr/local/bin/
INSTALLS += target
Related
I am currently using Ubuntu 14.04 LTS.
How can I statically build Qt 4.8.5 -
https://download.qt.io/archive/qt/4.8/4.8.5/qt-everywhere-opensource-src-4.8.5.tar.gz
such that when I cmake OpenCV 2.4.13 -
https://github.com/opencv/opencv/archive/2.4.13.zip
it correctly identifies the location of Qt4 ?
When I cmake OpenCV after I have installed Qt4 in /usr/local/qt4-static/, the find_package(Qt4 REQUIRED QtCore QtGui QtTest) function call within opencv-2.4.13/cmake/OpenCVFindLibsGUI.cmake fails because it cannot find qmake. Also, upon running the qmake -query in the terminal, Ubuntu says that qmake is not installed, when it clearly in /usr/local/qt4-static/.
How should I go about this so OpenCV cmake correctly recognizes Qt4 ?
Build Qt
Extract the source-code and run ./configure && make and then sudo make install. It should create all necessary configuration to run qmake in any folder (system-wide).
Additional: create a symlink/export (use only if make install did not work for you)
You need to promote qmake to $PATH or create a symlink, but this is usually done when you run sudo make install after make in the Qt source-folder.
root:/home# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:
Symlink (permanently)
ln -s /path/to/qmake /usr/sbin/qmake
or
export (temporary)
export PATH=$PATH:/folder/of/qmake
Afterwards qmake -v is working whereever you are
root:/tmp qmake -v
QMake version 3.1
Using Qt version 5.10.1 in /usr/local/Qt-5.10.1/lib
If your project still cannot determine the location of Qt, read the pro/pri/cmake file to understand how it looks for the path.
I'm new to opencv. I installed it on my computer using cmake following the tutorial in their website.
mkdir Desctop/opencv
cd Desctop/opencv
git clone https://github.com/Itseez/opencv.git
cd opencv
mkdir release
cd release
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..
make
sudo make install
And to compile with opencv using cmake, I add the CMakeLists.txt file in the cpp file directory then execute
cd <cpp file directory>
cmake .
make
But now I know more about opencv. I know that I can make GUI windows with it; I can make buttons, scroll bars and many other UI controls.
But I can't use the GUI tools unless I integrated cmake with QT.I'm not sure how should it be, but I thing it would be something like
cmake -D WITH_QT=ON ..
Reference
But the problem is that I've already installed opencv and I don't know how can I change it's configurations to use QT.
I tried to install cmake-gui to change the opencv installation configurations but I didn't find anything for opencv in the program.
My questions
Do I need to re-install opencv or it's possible to change the settings or changing the content of CMakeLists.txt file?
How can I change the configurations of the current opencv installation so it support QT?
would I need to change the CMakeLists.txt file after changing opencv's configurations?
I have application which uses QFtp class.I have made in Qt 4 version.
But now i want to complie QFtp classe in Qt5 but it's showing some error like:
'QFtp' doesn't name and type.
how to resolve this issue. I don't want to use QNetworkAccessManager. is there any way to this?
Thank you
For the sake of completeness, the steps to use the add-ons are:
Download the sources for the add-on from https://github.com/qt/qtftp
Extract the sources somewhere (e.g. Qt5.x.y/Src/qtmyaddon)
Open a console in that folder
Read readme.txt and run the appropriate commands with the latest QT version
Run qmake
Run make (or nmake or mingw32-make or whatever)
Run sudo make install (nmake install, mingw32-make install, ...)
In the .pro file of your project, add "QT += myaddon" (e.g. "QT += ftp")
Run qmake on your project
Compile your project
qmake: could not find a Qt installation of ''
This thread was not of any help to me. qmake: could not find a Qt installation of ''.
How can I get qmake to recognize where the Qt folder is?
Right now it is installed in /opt/Qt5.1.0.
Have you installed the qt5-default ? You need to do this in addition to running the Qt supplier .run file.
sudo apt-get install qt5-default
This message shown by qtchooser app.
To setup it properly, you should make conf files in /etc/xdg/qtchooser/
for example:
$ ls -1 /etc/xdg/qtchooser/
default.conf
qt-4.8.5.conf
qt-5.1.0.conf
each file has two lines: path to bin, path to lib:
$ cat /etc/xdg/qtchooser/default.conf
/opt/Qt/4.8.5/bin
/opt/Qt/4.8.5/lib
additional info: man qtchooser
The solution for me on this problem was to specify the QT version, as this message was being generated by /usr/bin/qtchooser
So in my case, it was QT4 I was trying to use, and running:
qmake
generated the error (could not find a Qt installation of '')
qmake -qt=qt4
fixed that error though. In my case, it was a Ruby Gem trying to compile with qmake, so I couldn't get it to pass in that extra command line argument, so I instead added this to my profile
export QT_SELECT=qt4
And now QT4 runs just fine on my Ubuntu system.
For me the symlink to default.conf was missing in /usr/share/qtchooser. It wasn't enough to put it into /etc/xdg/qtchooser.
I am trying to understand 'qmake' by following this tutorial . but when I come the the following command:
qmake -o Makefile hello.pro
my command line console shows me this message:
'qmake' is not recognized as an internal or external command, operable program or batch file
I understood that qmake is part of Qt creator and thus it should be executed whenever I run it within my project's folder. so, why it is not recognized ?
In the start menu entry that was created by the installer for Qt, you should find an item that opens a command prompt with all the needed environment variables (including the PATH) already set. For my Qt 5.0.2 install using MingW, it is called "Qt 5.0.2 for Desktop (MinGW 4.7)".
On Windows, you can add path to qmake to PATH or run qmake from directory where it placed, or use absolute path.
Sorry my friend, i don´t speak English very well.
In Qt 5.10.1 I resolved this problem running the command prompt in the next path, C:\Qt\5.10.1\mingw53_32>, after you need change the directory where is the file hello.pro and run the commnand qmake -o Makefile hello.pro after you can see the makefile in the respective folder.