Update IDEApp.bf

IDE/src/IDEApp.bf

@@ -10281,7 +10281,10 @@ namespace IDE
 										newString.Append(mInstallDir);
 										newString.Append("Beef", IDEApp.sRTVersionStr, "RT");
 										newString.Append((Workspace.PlatformType.GetPtrSizeByName(gApp.mPlatformName) == 4) ? "32" : "64");
-										newString.Append("_wasm.a\"");
+										newString.Append("_wasm");
+	  									if (project.mWasmOptions.mEnableThreads)
+	    										newString.Append("_pthread");
+	       									newString.Append(".a\"");
 									default:
 									}