--- a/include/vpf.h	2016-03-03 14:40:01.000000000 +0100
+++ b/include/vpf.h	2018-01-11 11:45:26.521900821 +0100
@@ -30,6 +30,8 @@
 #ifndef VPF_H_INCLUDED
 #define VPF_H_INCLUDED
 
+#include <sys/types.h>
+
 struct vpf_fh;
 
 struct vpf_fh *VPF_Open(const char *path, mode_t mode, pid_t *pidptr);
--- a/include/vsb.h	2017-11-14 14:39:22.000000000 +0100
+++ b/include/vsb.h	2018-01-11 11:48:15.505912873 +0100
@@ -31,6 +31,8 @@
 #ifndef VSB_H_INCLUDED
 #define VSB_H_INCLUDED
 
+#include <sys/types.h>
+
 /*
  * Structure definition
  */