- Qt Creator Documentation
- Edit environment settings
- Qt Creator 15.0.1

How To

# Edit environment settings

You can change the environment variable values for build or run environments either for a particular project or globally:

- To change values globally, go to Preferences > Environment > System, and select Change in Environment.
- To change values for a project, select Edit or Add in the project, build, or run environment settings.

Use the following syntax to enter environment variable names and values: `<VARIABLE>=<VALUE>`. To temporarily disable a variable, add a hash character (#) to the beginning of the line.

Note: Using this approach for a different statement (append, prepend, unset) may result in unexpected changes of the environment.

To remove a variable value from the environment, enter the variable name. For example, `TEST` sets the value of the `TEST` variable empty when building or running the project.

To add a variable value to the environment, enter the variable name and value, separated by the equals sign. For example, the following line prepends the `/opt/bin` folder to the existing PATH:

- On Windows: `PATH=C:\opt\bin;${PATH}`
- On Linux: `PATH=/opt/bin:${PATH}`

To add or remove several variables, place them on separate lines. The order is important. If you remove a value on a line, you cannot refer to it on the following lines. However, you can remove a value after you have referred to it on an earlier line.

To add a comment or disable any of the above actions, prefix it with two hash characters (##).

See also Specify the environment for projects, Configure projects for building, Configure projects for running, and Use Qt Creator variables.