Recognize the Darwin platform alias as macOS

saferalloc/build.gradle

@@ -12,7 +12,7 @@ def arch = System.getProperty('os.arch', '').toLowerCase()
 
 def nativesProject
 def nativeExt
-if (osName.contains('win')) {
+if (osName.startsWith('win')) {
   if (arch == 'aarch64' || arch == 'arm64') {
     nativesProject = project(':saferalloc-natives-windows-aarch64')
   } else {

saferalloc/src/main/java/org/ngengine/saferalloc/NativeLibraryLoader.java

@@ -176,7 +176,7 @@ private static String detectOs() {
       return "android";
     }
     String n = System.getProperty("os.name", "").toLowerCase(Locale.ROOT);
-    if (n.contains("win")) return "windows";
+    if (n.startsWith("win")) return "windows";
     if (n.contains("mac") || n.contains("darwin")) return "macos";
     return "linux";
   }

saferalloc/src/test/java/org/ngengine/saferalloc/NativeLibraryLoaderTest.java

@@ -0,0 +1,43 @@
+package org.ngengine.saferalloc;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.lang.reflect.Method;
+import org.junit.jupiter.api.Test;
+
+class NativeLibraryLoaderTest {
+  @Test
+  void detectsDesktopOperatingSystems() throws Exception {
+    String originalOs = System.getProperty("os.name");
+    String originalRuntime = System.getProperty("java.runtime.name");
+    String originalVm = System.getProperty("java.vm.name");
+    try {
+      System.setProperty("java.runtime.name", "OpenJDK Runtime Environment");
+      System.setProperty("java.vm.name", "OpenJDK 64-Bit Server VM");
+      Method detectOs = NativeLibraryLoader.class.getDeclaredMethod("detectOs");
+      detectOs.setAccessible(true);
+      String[][] cases = {
+          {"Linux", "linux"},
+          {"Windows 11", "windows"},
+          {"Mac OS X", "macos"},
+          {"Darwin", "macos"}
+      };
+      for (String[] testCase : cases) {
+        System.setProperty("os.name", testCase[0]);
+        assertEquals(testCase[1], detectOs.invoke(null), testCase[0]);
+      }
+    } finally {
+      restoreProperty("os.name", originalOs);
+      restoreProperty("java.runtime.name", originalRuntime);
+      restoreProperty("java.vm.name", originalVm);
+    }
+  }
+
+  private static void restoreProperty(String name, String value) {
+    if (value == null) {
+      System.clearProperty(name);
+    } else {
+      System.setProperty(name, value);
+    }
+  }
+}