Fix platform detection
diff --git a/src/core/lib/iomgr/ev_epoll_linux.c b/src/core/lib/iomgr/ev_epoll_linux.c
index ab77ebc..249bc98 100644
--- a/src/core/lib/iomgr/ev_epoll_linux.c
+++ b/src/core/lib/iomgr/ev_epoll_linux.c
@@ -1892,6 +1892,10 @@
     return NULL;
   }
 
+  if (!grpc_has_wakeup_fd) {
+    return NULL;
+  }
+
   if (!is_epoll_available()) {
     return NULL;
   }