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How To Install Both qt5-qmake and qt4-qmake on Ubuntu with PPA

Ubuntu 7

In this article, we will guide you through the process of installing both qt5-qmake and qt4-qmake on Ubuntu using PPA (Personal Package Archives).

Introduction

Qt is a cross-platform application framework that is widely used for developing software with a graphical user interface (GUI), and also for developing non-GUI programs such as command-line tools and consoles for servers. qmake is a utility that automates the generation of Makefiles. Makefiles are used to build an application – they contain instructions for the “make” tool to generate executable files.

Prerequisites

Before you begin, you need to have Ubuntu installed on your system. This guide assumes you are using Ubuntu 12.04 LTS, but the steps should be similar for other versions.

Adding the PPA

The first step is to add the PPA from the ubuntu-sdk-team. This PPA contains the packages for qt5-qmake and qt4-qmake. To add the PPA, open a terminal and enter the following command:

sudo add-apt-repository ppa:ubuntu-sdk-team/ppa

This command adds the PPA to your system’s software sources. The “sudo” command is used to execute commands with root privileges, “add-apt-repository” is the command to add a PPA, and “ppa:ubuntu-sdk-team/ppa” is the PPA we are adding.

Updating the Package List

After adding the PPA, you need to update your system’s package list to include the packages from the new PPA. To do this, enter the following command in the terminal:

sudo apt-get update

The “apt-get update” command fetches the package lists from the repositories and “updates” them to get information on the newest versions of packages and their dependencies.

Installing qt5-qmake and qt4-qmake

Now that the PPA is added and the package list is updated, you can install qt5-qmake and qt4-qmake. Enter the following commands in the terminal:

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

The “apt-get install” command is used to install a package, and “qt5-qmake” and “qt4-qmake” are the packages we are installing.

Resolving Dependency Conflicts

In some cases, there may be dependency conflicts that prevent you from installing both qt5-qmake and qt4-qmake. If you encounter such conflicts, you can try manually downloading and installing the packages or using the Qt installer.

To manually download the packages, you can use the Ubuntu Packages Search tool. Once downloaded, you can install them using the “dpkg -i” command.

To use the Qt installer, you can download it from the official Qt website. The installer allows you to select and install specific components, including qt5-qmake and qt4-qmake.

Switching Between qt5-qmake and qt4-qmake

If you are unable to install both versions, you can use environment variables to switch between them. The QT_SELECT environment variable can be used for this purpose. Set it to 4 to use qt4-qmake and set it to 5 to use qt5-qmake. You can set this variable in your shell profile file or in the terminal before running qmake.

export QT_SELECT=4

Conclusion

This guide has walked you through the process of installing both qt5-qmake and qt4-qmake on Ubuntu using PPA. Please note that these solutions may vary depending on your specific setup and requirements. If you encounter any issues, consult the official documentation or seek further assistance.

What is the purpose of installing both qt5-qmake and qt4-qmake on Ubuntu?

Installing both qt5-qmake and qt4-qmake allows you to build applications using either version of the Qt framework. This is useful if you have existing projects that were developed using Qt4 and want to migrate them to Qt5, or if you need to maintain compatibility with older Qt4 applications while developing new ones with Qt5.

How do I install qt5-qmake and qt4-qmake on Ubuntu?

You can install qt5-qmake and qt4-qmake on Ubuntu by adding the ubuntu-sdk-team PPA to your system’s software sources, updating the package list, and then installing the packages using the apt-get command. Please refer to the steps outlined in the article for detailed instructions.

What if I encounter dependency conflicts while installing qt5-qmake and qt4-qmake?

If you encounter dependency conflicts, you can try manually downloading and installing the packages or using the Qt installer. Please refer to the section "Resolving Dependency Conflicts" in the article for more information.

How can I switch between qt5-qmake and qt4-qmake?

If you are unable to install both versions, you can use the QT_SELECT environment variable to switch between qt5-qmake and qt4-qmake. Set the QT_SELECT variable to 4 to use qt4-qmake and set it to 5 to use qt5-qmake. Please refer to the section "Switching Between qt5-qmake and qt4-qmake" in the article for more details.

Where can I find further assistance or documentation?

If you encounter any issues or need further assistance, you can consult the official documentation for Qt or seek help from the Ubuntu community. The official Qt website and the Ubuntu forums are good resources for finding answers to specific questions or troubleshooting any problems you may encounter.

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