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docs: improve build_and_run.md (#1524)
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# Install Qt 6.x and setup/build gpt4all-chat from source
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# Building gpt4all-chat from source
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Depending upon your operating system, there are many ways that Qt is distributed.
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Here is the recommended method for getting the Qt dependency installed to setup and build
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gpt4all-chat from source.
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## Create a [Qt account](https://login.qt.io/register)
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## Prerequisites
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On Windows and Linux, GPT4All requires Vulkan. You may download it from here: https://vulkan.lunarg.com/sdk/home
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## Go to the Qt open source [download page](https://www.qt.io/download-qt-installer-oss)
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macOS users do not need Vulkan, as GPT4All will use Metal instead.
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## Note for Linux users
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## Start the installer and sign in
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Linux users may install Qt via their distro's official packages instead of using the Qt installer. You need at least Qt 6.5, with support for QPdf and the Qt HTTP Server. It should be straightforward to build with just cmake and make, but you may continue to follow these instructions to build with Qt Creator.
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On Arch Linux, this looks like:
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```
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sudo pacman -S --needed base-devel qt6-base qt6-httpserver qtcreator cmake ninja
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```
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## After some screens about license, select custom
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On Ubuntu 23.04, this looks like:
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```
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sudo apt install build-essential libqt6gui6 qt6-base-dev libqt6httpserver6 qt6-httpserver-dev qtcreator cmake ninja-build
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```
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## Download Qt
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## Select the following
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- Go to https://login.qt.io/register to create a free Qt account.
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- Download the Qt Online Installer for your OS from here: https://www.qt.io/download-qt-installer-oss
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- Sign into the installer.
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- Agree to the terms of the (L)GPL 3 license.
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- Select whether you would like to send anonymous usage statistics to Qt.
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- On the Installation Folder page, leave the default installation path, and select "Custom Installation".
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## Customize the installation
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NOTE: This is for macOS. For Linux it is similar, but you need MSVC for Windows, not the mingw install
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Under "Qt", find the latest Qt 6.x release.
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## Open up QtCreator
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Under this release (e.g. Qt 6.5.0), select the target platform:
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- On macOS, it is just called "macOS".
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- On Windows, it is called "MSVC 2019 64-bit" (for 64-bit x86 CPUs). MinGW has not been tested.
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Under this release, select the following additional components:
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- Qt Quick 3D
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- Qt 5 Compatibility Module
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- Qt Shader Tools
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- Additional Libraries (clicking the checkbox to the left of this item enables all of them)
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- Qt Debug information Files
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- Qt Quick Timeline
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## Clone the git repo for gpt4all-chat
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Under Developer and Designer Tools, select the following components:
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- Qt Creator
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- Qt Creator CDB Debugger Support (for Windows only)
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- Debugging Tools for Windows (for Windows only)
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- CMake
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- Ninja
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Agree to the license and complete the installation.
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## Download the source code
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You must use git to download the source code for gpt4all:
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```
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git clone --recurse-submodules https://github.com/nomic-ai/gpt4all
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```
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## Open the gpt4all-chat project in QtCreator
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Note the use of --recurse-submodules, which makes sure the necessary dependencies are downloaded inside the repo. This is why you cannot simply download a zip archive.
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Windows users: To install git for Windows, see https://git-scm.com/downloads. Once it is installed, you should be able to shift-right click in any folder, "Open PowerShell window here" (or similar, depending on the version of Windows), and run the above command.
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## Open gpt4all-chat in Qt Creator
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Open Qt Creator. Navigate to File > Open File or Project, find the "gpt4all-chat" folder inside the freshly cloned repository, and select CMakeLists.txt.
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NOTE: File->Open File or Project and navigate to the gpt4all-chat repo and choose the CMakeLists.txt
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## Configure project
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You can now expand the "Details" section next to the build kit. It is best to uncheck all but one build configuration, e.g. "Release", which will produce optimized binaries that are not useful for debugging.
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Click "Configure Project", and wait for it to complete.
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## Build project
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Now that the project has been configured, click the hammer button on the left sidebar to build the project.
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## Run project
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Click the play button on the left sidebar to run the Chat UI.
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## Updating the downloaded source code
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You do not need to make a fresh clone of the source code every time. To update it, you may open a terminal/command prompt in the repository, run `git pull`, and then `git submodule update --init --recursive`.
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