diff -ur xapian-core-1.4.10/examples/xapian-pos.cc xapian-core-1.4.10.patched/examples/xapian-pos.cc
--- xapian-core-1.4.10/examples/xapian-pos.cc	2019-02-11 22:27:21.000000000 +0100
+++ xapian-core-1.4.10.patched/examples/xapian-pos.cc	2019-02-18 16:43:08.593354559 +0100
@@ -29,6 +29,7 @@
 #include <algorithm>
 #include <cstdlib>
 #include <limits>
+#include <errno.h>
 
 #include "gnu_getopt.h"
 #include "stringutils.h"