--- nfs-utils-2.6.4.orig/support/reexport/fsidd.c	2023-11-17 18:32:39.000000000 +0100
+++ nfs-utils-2.6.4/support/reexport/fsidd.c	2024-01-04 13:47:58.231661971 +0100
@@ -6,6 +6,7 @@
 #ifdef HAVE_DLFCN_H
 #include <dlfcn.h>
 #endif
+#include <unistd.h>
 #include <event2/event.h>
 
 #include "conffile.h"