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You can't build using Linux because the project use the UnityEngine.dll.

Install Unity

• The project is using the version 2020.3.29f1. If you want to change the version of the unity you need change every csproj file in ImGui.Net/src

Install LuaJIT

• Mac you could use https://formulae.brew.sh/formula/luajit
• Windows you could use binary
• Linux (not tested)

Install Visual Studio

• It's necessary only .NET Framework SDK. If you already have VS Studio installed, instsall .NET only
• It could be done using only NET.Core, but I didn't tested. If you could run without VS Studio, please leave a comment
• Install dotnet 2.0 https://dotnet.microsoft.com/en-us/download/dotnet/2.0

You’ll need GCC (or other as clang)

• https://gcc.gnu.org/install/binaries.html
• Mac you could use brew install gcc
• Windows you could use MinGW
  • Don’t forget to put MinGW\bin into your PATH

Install Freetype

• For mac users, you could use brew install freetype

Clone repos below recursively

• https://github.com/psydack/ImGui.NET
• https://github.com/psydack/ImGui.NET-nativebuild

• update submodules

  • imgui inside cimgui with docking (or any branch you want to)
    • probably you'll need to change some declarations

• Ensure -std=c++11 is on ImGui.Net-nativebuild/cimgui/makefile CXXFLAGS

• ImGui.Net-nativebuild/cimgui/imgui/misc/freetype/imgui_freetype.[cpp and h] change path imgui.h to ../../imgui.h, imgui_internal.h and imstb_rectpack.h

• Enable on ImGui.Net-nativebuild/cimgui/imgui/imguiconfig.h

  • #define IMGUI_USE_WCHAR32
  • #define IMGUI_ENABLE_FREETYPE
  • #define IMGUI_ENABLE_STB_TRUETYPE

1. Generate definitions running ImGui.NET-nativebuild/generate-all.[sh or bat]
2. Copy new definitions to ImGui.NET project running ImGui.NET-nativebuild/copy-jsons-to-generatecode-csharp.[sh or bat]
3. Generate code from new definitions and add to the project
   • MAC: Run ImGui.NET/ci.sh
   • Windows run dotnet run inside ImGui.NET/src/CodeGenerator or open the .sln into Visual Studio and run the project CodeGenerator.
     • Something like: Outputting generated code files to ... must to appear
     • Copy generated code to each project src running CopyGenCodeToSrc.[sh or bat]