https://bugs.gentoo.org/424673

 src/lib/util.cc                     | 1 +
 src/watch_maildirs/inotify/state.cc | 1 +
 2 files changed, 2 insertions(+)

--- a/src/lib/util.cc
+++ b/src/lib/util.cc
@@ -6,6 +6,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
+#include <unistd.h>
 
 #include <sstream>
 #include <string>
--- a/src/watch_maildirs/inotify/state.cc
+++ b/src/watch_maildirs/inotify/state.cc
@@ -1,6 +1,7 @@
 #include <assert.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <unistd.h>
 
 #include "lib/util.h"
 #include "state.h"