Create BUILDING-ALT.md

docs/BUILDING-ALT.md

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+# Building
+
+## 1. Clone the Repository
+
+Clone **UnleashedRecomp** with submodules using [git](https://git-scm.com/).
+```
+git clone --recurse-submodules https://github.com/hedge-dev/UnleashedRecomp.git
+```
+### Windows
+
+If you skipped the `--recurse-submodules` argument during cloning, you can run `update_submodules.bat` to ensure submodules are pulled.
+
+## 2. Add the Game's Files
+
+Locate the following files from the game and place them inside `./UnleashedRecompLib/private/`:
+   *  `default.xex` and `shader.ar`: You can find them on the `game` directory of an Unleashed Recompiled installation or extract them from the game's base contents.
+   *  `default.xexp`: You can find it on the `update` directory of an Unleashed Recompiled installation or extract them from the game's title update.
+  
+> [!NOTE]
+> It's recommended to just install the game using an existing [Unleashed Recompiled release](https://github.com/hedge-dev/UnleashedRecomp/releases/latest) to acquire these files if possible, as you'll need to rely on third-party tools to extract them otherwise.
+
+## 3. Install Dependencies
+
+### Windows
+You will need to install [Visual Studio 2022](https://visualstudio.microsoft.com/downloads/).
+In the setup process you'll need to select the following options and tools for installation:
+- Desktop development with C++
+- C++ Clang Compiler for Windows
+- C++ CMake tools for Windows
+
+## Linux
+The following command will install the required dependencies on a distro that uses `apt` such as Ubuntu, but you can find the equivalent packages for your preferred distro.
+```bash
+sudo apt install autoconf automake libtool pkg-config curl cmake ninja-build clang clang-tools libgtk-3-dev
+```
+> [!NOTE]
+>  This list may not be comprehensive to your particular distro and you may be required to install additional packages if an error happens during configuration.
+## 4. Building the Project
+
+### Windows
+1. Open the repository directory in Visual Studio 2022 and wait for CMake generation to complete. If you don't plan to debug, switch to the `Release` configuration.
+> [!NOTE]
+> If you need a Release-performant build and want to iterate on development without debugging, it is highly recommended that you use the `RelWithDebInfo` configuration for faster compile times.
+2. Under Solution Explorer, right-click and choose **Switch to CMake Targets View**.
+3. Right-click the **UnleashedRecomp** project and choose **Set as Startup Item**, then choose **Add Debug Configuration**.
+4. Add a `currentDir` property to the first element under `configurations` in the generated JSON and set its value to the path to your game directory (where root is the directory containing `dlc`, `game`, `update`, etc).
+5. Start **UnleashedRecomp**. The initial compilation may take a while to complete due to code and shader recompilation.
+
+### Linux
+1. Configure the project using CMake by navigating to the repository and running the following command. The presets available are `linux-debug`, `linux-relwithdebinfo` and `linux-release`.
+```bash
+cmake . --preset linux-release
+```
+2. Build the project using the selected configuration.
+```bash
+cmake --build ./out/build/linux-release --target UnleashedRecomp
+```
+3. Navigate to the directory that was specified as the output in the previous step and run the game.
+```bash
+./UnleashedRecomp
+```