Method AddThirdPartyLibrary

Source/URLab/URLab.Build.cs:141–229

(string LibraryName, ReadOnlyTargetRules Target)

	}

	private void AddThirdPartyLibrary(string LibraryName, ReadOnlyTargetRules Target)
	{
		string FullPath = Path.Combine(ThirdPartyPath, LibraryName);
		
		// Add include directory if it exists
		string IncludePath = Path.Combine(FullPath, "include");
		if (Directory.Exists(IncludePath))
		{
			PublicIncludePaths.Add(IncludePath);
		}

		if (Target.Platform == UnrealTargetPlatform.Win64)
		{
			// Link all libraries in the lib directory
			string LibPath = Path.Combine(FullPath, "lib");
			if (Directory.Exists(LibPath))
			{
				string[] LibFiles = Directory.GetFiles(LibPath, "*.lib", SearchOption.AllDirectories);
				foreach (string LibFile in LibFiles)
				{
					PublicAdditionalLibraries.Add(LibFile);
				}
			}

			// Stage DLLs next to executable for packaged builds
			// Skip MSVC runtime DLLs (handled by redistributable installer)
			string BinPath = Path.Combine(FullPath, "bin");
			if (Directory.Exists(BinPath))
			{
				string[] DllFiles = Directory.GetFiles(BinPath, "*.dll", SearchOption.AllDirectories);
				foreach (string DllFile in DllFiles)
				{
					string DllName = Path.GetFileName(DllFile);
					if (DllName.StartsWith("vcruntime") || DllName.StartsWith("msvcp") || DllName.StartsWith("concrt"))
						continue;
					RuntimeDependencies.Add("$(BinaryOutputDir)/" + DllName, DllFile, StagedFileType.NonUFS);
					PublicDelayLoadDLLs.Add(DllName);
				}
			}
		}
		else if (Target.Platform == UnrealTargetPlatform.Linux)
		{
			// On Linux the URLab plugin .so already gets `${ORIGIN}` added to
			// its RPATH by UBT, so the runtime loader resolves third-party
			// shared libs (libmujoco / lib_coacd / libzmq) from the plugin's
			// own Binaries/Linux/ directory. The `setup_rpath_linux.sh`
			// helper symlinks third_party/install/<pkg>/lib/*.so* into
			// Binaries/Linux/ after the plugin builds, so no LD_LIBRARY_PATH
			// is needed at editor / packaging time.
			//
			// (UBT's auto-computed relative RPATH from absolute lib paths
			// resolves incorrectly when the plugin lives outside the host
			// project — the ${ORIGIN}/../../../../UnrealEngine/.. chain it
			// emits assumes engine and project share a common ancestor.
			// Staging via $ORIGIN sidesteps that entirely.)
			string LibPath = Path.Combine(FullPath, "lib");
			if (Directory.Exists(LibPath))
			{