- Qt 5.15
- Qt for macOS - Building from Source
- Qt 5.15.2 Reference Documentation

# Qt for macOS - Building from Source

## Requirements

Qt requires a macOS platform SDK and corresponding toolchain to be installed on the system. You can get this by installing the Xcode command line tools:

     xcode-select --install

Or by downloading and installing Xcode.

### Compiler Versions

Qt for macOS is tested and compatible with several versions of GCC (GNU Compiler Collection) and Clang (as available from Xcode). For a list of tested configurations, refer to the Reference Configuration section of the supported platforms page.

## QDoc Dependencies

Since version 5.11, QDoc uses Clang to parse C++ code. If you wish to build QDoc manually, refer to Installing Clang for QDoc for specific build requirements.

## Steps for Building

The following instructions describe how to build Qt from the source package. You can download the Qt 5 sources from the Downloads page. For more information, visit the Getting Started with Qt page.

### Step 1: Install the License File (Commercially Licensed Qt Only)

If you use Qt with a commercial license, the Qt tools look for a local license file. If you are using a binary installer or the commercial Qt Creator, your licenses are automatically fetched and stored in your local user profile (`$HOME/Library/Application Support/Qt/qtlicenses.ini` file).

If you do not use any binary installer or Qt Creator, you can download the respective license file from your Qt Account Web portal and save it to your user profile as `$HOME/.qt-license`. If you prefer a different location or file name, you need to set the `QT_LICENSE_FILE` environment variable to the respective file path.

### Step 2: Unpack the Archive

Unpack the archive if you have not done so already. For example, if you have the `qt-everywhere-opensource-src-%VERSION%.tar.gz` package, type the following commands at a command line prompt:

     cd /tmp
     gunzip qt-everywhere-opensource-src-%VERSION%.tar.gz        # uncompress the archive
     tar xvf qt-everywhere-opensource-src-%VERSION%.tar          # unpack it

This creates the directory `/tmp/qt-everywhere-opensource-src-%VERSION%` containing the files from the archive.

### Step 3: Build the Qt Library

To configure the Qt library for your machine type, run the `./configure` script in the package directory.

By default, Qt is configured for installation in the `/usr/local/Qt-%VERSION%` directory, but this can be changed by using the `-prefix` option.

     cd /tmp/qt-everywhere-opensource-src-%VERSION%
     ./configure

By default, Qt is built as a framework, but you can built it as a set of dynamic libraries (dylibs) by specifying the `-no-framework` option.

Qt can also be configured to be built with debugging symbols. This process is described in detail in the Debugging Techniques document.

The Configure Options page contains more information about the configure options.

To create the library and compile all the examples and tools, type:

     make

If `-prefix` is outside the build directory, you need to install the library, examples, and tools in the appropriate place. To do this, type:

     sudo make -j1 install

This command requires that you have administrator access on your machine.

Note: There is a potential race condition when running make install with multiple jobs. It is best to only run one make job (-j1) for the install.

### Step 4: Set the Environment Variables

In order to use Qt, some environment variables need to be extended.

     PATH               - to locate qmake, moc and other Qt tools

This is done like this:

In `.profile` (if your shell is bash), add the following lines:

     PATH=/usr/local/Qt-%VERSION%/bin:$PATH
     export PATH

In `.login` (in case your shell is csh or tcsh), add the following line:

     setenv PATH /usr/local/Qt-%VERSION%/bin:$PATH

If you use a different shell, please modify your environment variables accordingly.

Qt is now installed.

## Step 5: Build the Qt Documentation

For the Qt reference documentation to be available in Qt Assistant, you must build it separately:

     make docs

## Limitations

### Fink

If you have installed the Qt for X11 package from Fink, it will set the `QMAKESPEC` environment variable to `darwin-g++`. This will cause problems when you build the Qt for macOS package. To fix this, simply unset your `QMAKESPEC` or set it to `macx-g++` before you run `configure`. To get a fresh Qt distribution, run `make confclean` on the command-line.