Index: src/backend/distributed/Makefile
--- src/backend/distributed/Makefile.orig	2018-01-16 09:46:29.000000000 +0100
+++ src/backend/distributed/Makefile	2018-01-16 23:43:40.803854000 +0100
@@ -29,7 +29,7 @@
 	$(patsubst $(citus_abs_srcdir)/%.c,%.o,$(foreach dir,$(SUBDIRS), $(sort $(wildcard $(citus_abs_srcdir)/$(dir)/*.c))))
 
 # be explicit about the default target
-all:
+all: citus.so
 
 # generate each version's file installation file by concatenating
 # previous upgrade scripts
Index: src/backend/distributed/executor/multi_real_time_executor.c
--- src/backend/distributed/executor/multi_real_time_executor.c.orig	2018-01-16 23:43:40.804170000 +0100
+++ src/backend/distributed/executor/multi_real_time_executor.c	2018-01-16 23:44:06.869565000 +0100
@@ -19,6 +19,8 @@
 #include "postgres.h"
 #include "miscadmin.h"
 
+#include <sys/types.h>
+#include <sys/stat.h>
 #include <unistd.h>
 
 #include "access/xact.h"
Index: src/backend/distributed/executor/multi_task_tracker_executor.c
--- src/backend/distributed/executor/multi_task_tracker_executor.c.orig	2018-01-16 09:46:29.000000000 +0100
+++ src/backend/distributed/executor/multi_task_tracker_executor.c	2018-01-16 23:43:40.804658000 +0100
@@ -20,6 +20,7 @@
 #include "postgres.h"
 #include "miscadmin.h"
 
+#include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <math.h>
Index: src/backend/distributed/worker/worker_partition_protocol.c
--- src/backend/distributed/worker/worker_partition_protocol.c.orig	2018-01-16 09:46:29.000000000 +0100
+++ src/backend/distributed/worker/worker_partition_protocol.c	2018-01-16 23:43:40.804894000 +0100
@@ -18,6 +18,7 @@
 #include "funcapi.h"
 #include "pgstat.h"
 
+#include <sys/types.h>
 #include <arpa/inet.h>
 #include <netinet/in.h>
 #include <sys/stat.h>