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Documentation: Debian gcc-9 installation instructions

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We already have installation instructions for ubuntu but not yet for
Debian. Gcc-9 is not available on Debian stable so instructions for
switching to and from Debian testing are added.
This commit is contained in:
Robbe De Greef 2020-09-26 14:58:23 +02:00 committed by Andreas Kling
parent 926fb3ff48
commit fd7a2278b9
Notes: sideshowbarker 2024-07-19 02:13:13 +09:00 
Author: https://github.com/RobbeDGreef
Commit: https://github.com/SerenityOS/serenity/commit/fd7a2278b99
Pull-request: https://github.com/SerenityOS/serenity/pull/3611
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18
Documentation/BuildInstructions.md
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@ -37,6 +37,24 @@ sudo apt-get install gcc-9 g++-9
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 900 --slave /usr/bin/g++ g++ /usr/bin/g++-9
```
On Debian you can install it by switching to the Debian testing branch:
```bash
sudo echo "deb http://http.us.debian.org/debian/ testing non-free contrib main" >> /etc/apt/sources.list
sudo apt update
```
Afterwards you can install gcc-9 with apt like:
```bash
sudo apt install gcc-9 g++-9
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 900 --slave /usr/bin/g++ g++ /usr/bin/g++-9
```
If you don't want to stay on the testing branch you can switch back by running:
```bash
sudo sed -i '$d' /etc/apt/sources.list
sudo apt update
```
Ensure your CMake version is >= 3.16 with `cmake --version`. If your system doesn't provide a suitable version of CMake, you can download a binary release from the [CMake website](https://cmake.org/download).
#### macOS prerequisites