diff --git a/src/ioslaves/file/fdreceiver.cpp b/src/ioslaves/file/fdreceiver.cpp
--- a/src/ioslaves/file/fdreceiver.cpp
+++ b/src/ioslaves/file/fdreceiver.cpp
@@ -18,9 +18,6 @@
     License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include <unistd.h>
-#include <sys/socket.h>
-
 #include <QSocketNotifier>
 
 #include "sharefd_p.h"
diff --git a/src/ioslaves/file/kauth/fdsender.cpp b/src/ioslaves/file/kauth/fdsender.cpp
--- a/src/ioslaves/file/kauth/fdsender.cpp
+++ b/src/ioslaves/file/kauth/fdsender.cpp
@@ -18,9 +18,6 @@
     License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include <unistd.h>
-#include <sys/socket.h>
-
 #include "../sharefd_p.h"
 #include "fdsender.h"
 
diff --git a/src/ioslaves/file/sharefd_p.h b/src/ioslaves/file/sharefd_p.h
--- a/src/ioslaves/file/sharefd_p.h
+++ b/src/ioslaves/file/sharefd_p.h
@@ -20,6 +20,14 @@
 
 #include <sys/un.h>
 #include <iostream>
+#include <unistd.h>
+#include <sys/socket.h>
+
+// fix SOCK_NONBLOCK for e.g. macOS
+#ifndef SOCK_NONBLOCK
+#include <fcntl.h>
+#define SOCK_NONBLOCK O_NONBLOCK
+#endif
 
 class SocketAddress
 {