-

Author: NSFatalError

Package.swift

@@ -54,7 +54,8 @@ let package = Package(
                 ),
                 .product(
                     name: "SwiftCompilerPlugin",
-                    package: "swift-syntax"
+                    package: "swift-syntax",
+                    condition: .when(platforms: [.macOS])
                 )
             ]
         ),
@@ -68,7 +69,8 @@ let package = Package(
                 ),
                 .product(
                     name: "SwiftCompilerPlugin",
-                    package: "swift-syntax"
+                    package: "swift-syntax",
+                    condition: .when(platforms: [.macOS])
                 )
             ]
         )

Sources/RelayMacros/Main/RelayPlugin.swift

@@ -6,14 +6,16 @@
 //  Copyright © 2025 Kamil Strzelecki. All rights reserved.
 //
 
-import PrincipleMacros
-import SwiftCompilerPlugin
+#if canImport(SwiftCompilerPlugin)
+    import PrincipleMacros
+    import SwiftCompilerPlugin
 
-@main
-internal struct RelayPlugin: CompilerPlugin {
+    @main
+    internal struct RelayPlugin: CompilerPlugin {
 
-    let providingMacros: [any Macro.Type] = [
-        PublishableMacro.self,
-        MemoizedMacro.self
-    ]
-}
+        let providingMacros: [any Macro.Type] = [
+            PublishableMacro.self,
+            MemoizedMacro.self
+        ]
+    }
+#endif