Go to Tools > Options > C/C++ >, click the Build Tools tab and configure your external C/C++ environment as required.After the plugin has been installed, click the Installed Plugins tab, check the Show Details checkbox and scroll down to verify that the C/C++ plugin is installed and Active:.The version for that plugin should be 1.31.5.1. Install the C/C++ plugin by clicking the Available Plugins tab, then checking the entry for C/C++.Ensure that only the entry for NbDevDarkBeans on the Settings tab is checked.In the Update Customizer Center screen, set Name to NBDevDarkThemes and URL to and click OK.Select Tools > Plugins > Settings then click the Add button.shows that C/C++ projects cannot be created by default. Opening the project wizard using File > New Project.These are the steps needed to make C++17 available on NetBeans 11.2: If you install a nightly build of NetBeans 8.2, or NetBeans 11.2, your existing installation of NetBeans 8.x will not be touched, so you can safely revert if necessary.An even better alternative (if it is possible for you) is to download and install the latest release of NetBeans, Apache NetBeans 11.2 which also provides C++17 as an option.Using a nightly build of NetBeans 8.2 instead of the standard release is also preferable because it contains many unrelated bug fixes.When you create subsequent C++ projects, the project wizard will continue to use the C++17 standard by default, so it becomes 'the default standard' unless/until you select an alternative.If you then select > Properties > Build > C++ Compiler you can verify that the C++17 standard is being used:

However, NetBeans Bug Report Bug 271136 - Support C++17 standard addressed this deficiency, and if you download and install any of the most recent nightly builds of NetBeans 8.2 from 2018 the issue is resolved C++17 is available as an option when creating a C++ project: The C++17 standard was published over a year after NetBeans 8.2 was released, so C++17 is not available as an option in the standard release of 8.2. Updated 3/28/21 for NetBeans 12, as documented at the end of this answer.

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