diff --git a/include/update.h b/include/update.h
deleted file mode 100644
index f19dd905..00000000
--- a/include/update.h
+++ /dev/null
@@ -1,42 +0,0 @@
-/*
- *  Empire - A multi-player, client/server Internet based war game.
- *  Copyright (C) 1986-2016, Dave Pare, Jeff Bailey, Thomas Ruschak,
- *                Ken Stevens, Steve McClure, Markus Armbruster
- *
- *  Empire is free software: you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, either version 3 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
- *  ---
- *
- *  See files README, COPYING and CREDITS in the root of the source
- *  tree for related information and legal notices.  It is expected
- *  that future projects/authors will amend these files as needed.
- *
- *  ---
- *
- *  update.h: Include headers used for updates
- *
- *  Known contributors to this file:
- *
- */
-
-#ifndef UPDATE_H
-#define UPDATE_H
-
-#include "file.h"
-#include "nat.h"
-#include "optlist.h"
-#include "prototypes.h"
-#include "sect.h"
-
-#endif
diff --git a/src/lib/update/age.c b/src/lib/update/age.c
index 5e19418a..aa7e29f2 100644
--- a/src/lib/update/age.c
+++ b/src/lib/update/age.c
@@ -33,7 +33,10 @@
 #include <config.h>
 
 #include "chance.h"
-#include "update.h"
+#include "file.h"
+#include "nat.h"
+#include "optlist.h"
+#include "prototypes.h"
 
 int
 age_people(int n, int etu)
diff --git a/src/lib/update/anno.c b/src/lib/update/anno.c
index 6c5601ed..6c3cfb5e 100644
--- a/src/lib/update/anno.c
+++ b/src/lib/update/anno.c
@@ -41,8 +41,9 @@
 #endif
 #include <stdio.h>
 #include <time.h>
+#include "optlist.h"
+#include "prototypes.h"
 #include "tel.h"
-#include "update.h"
 
 static int copy_and_expire(FILE *, FILE *, char *, time_t);
 static int copy_sink(char *, size_t, void *);
diff --git a/src/lib/update/bp.c b/src/lib/update/bp.c
index 8418031e..86991129 100644
--- a/src/lib/update/bp.c
+++ b/src/lib/update/bp.c
@@ -40,8 +40,10 @@
 
 #include <config.h>
 
+#include <stdlib.h>
 #include "budg.h"
-#include "update.h"
+#include "optlist.h"
+#include "sect.h"
 
 /* Item types we want to track. */
 enum bp_item_idx {
diff --git a/src/lib/update/deliver.c b/src/lib/update/deliver.c
index 66292375..ecb06508 100644
--- a/src/lib/update/deliver.c
+++ b/src/lib/update/deliver.c
@@ -32,10 +32,13 @@
 
 #include <config.h>
 
+#include "file.h"
 #include "item.h"
+#include "optlist.h"
 #include "path.h"
 #include "plague.h"
-#include "update.h"
+#include "sect.h"
+#include "prototypes.h"
 
 #define DELIVER_BONUS 4.0
 
diff --git a/src/lib/update/distribute.c b/src/lib/update/distribute.c
index d06beeea..803dcf7b 100644
--- a/src/lib/update/distribute.c
+++ b/src/lib/update/distribute.c
@@ -35,11 +35,13 @@
 #include <config.h>
 
 #include "distribute.h"
+#include "file.h"
 #include "item.h"
+#include "optlist.h"
 #include "path.h"
 #include "plague.h"
 #include "prototypes.h"
-#include "update.h"
+#include "sect.h"
 
 #ifdef DISTRIBUTE_DEBUG
 #define DPRINTF(fmt, ...) ((void)printf(fmt , ## __VA_ARGS__))
diff --git a/src/lib/update/finish.c b/src/lib/update/finish.c
index 88777aa1..a0bc18aa 100644
--- a/src/lib/update/finish.c
+++ b/src/lib/update/finish.c
@@ -38,8 +38,12 @@
 #include <stdlib.h>
 #include <sys/resource.h>
 #include "distribute.h"
+#include "file.h"
+#include "nat.h"
+#include "optlist.h"
 #include "path.h"
-#include "update.h"
+#include "sect.h"
+#include "prototypes.h"
 
 static void assemble_dist_paths(double *);
 
diff --git a/src/lib/update/human.c b/src/lib/update/human.c
index b7b3403a..07b30a79 100644
--- a/src/lib/update/human.c
+++ b/src/lib/update/human.c
@@ -37,9 +37,12 @@
 #include <math.h>
 #include "chance.h"
 #include "item.h"
+#include "optlist.h"
+#include "nat.h"
 #include "news.h"
 #include "player.h"
-#include "update.h"
+#include "prototypes.h"
+#include "sect.h"
 #include "xy.h"
 
 static int new_work(struct sctstr *, int);
diff --git a/src/lib/update/land.c b/src/lib/update/land.c
index 6f48a68e..0bb5c00e 100644
--- a/src/lib/update/land.c
+++ b/src/lib/update/land.c
@@ -38,12 +38,16 @@
 #include <math.h>
 #include "budg.h"
 #include "chance.h"
+#include "file.h"
 #include "land.h"
 #include "lost.h"
+#include "nat.h"
 #include "news.h"
+#include "optlist.h"
 #include "plague.h"
 #include "player.h"
-#include "update.h"
+#include "prototypes.h"
+#include "sect.h"
 
 static void landrepair(struct lndstr *, struct natstr *, struct bp *, int);
 static void upd_land(struct lndstr *, int, struct natstr *, struct bp *, int);
diff --git a/src/lib/update/main.c b/src/lib/update/main.c
index 63524d36..f6ed8cd5 100644
--- a/src/lib/update/main.c
+++ b/src/lib/update/main.c
@@ -38,11 +38,13 @@
 #include <sys/resource.h>
 #include "budg.h"
 #include "empthread.h"
+#include "file.h"
 #include "game.h"
 #include "journal.h"
+#include "optlist.h"
+#include "prototypes.h"
 #include "server.h"
 #include "unit.h"
-#include "update.h"
 
 int money[MAXNOC];
 int pops[MAXNOC];
diff --git a/src/lib/update/material.c b/src/lib/update/material.c
index 5781719c..5860a7e0 100644
--- a/src/lib/update/material.c
+++ b/src/lib/update/material.c
@@ -34,7 +34,8 @@
 #include <config.h>
 
 #include "chance.h"
-#include "update.h"
+#include "sect.h"
+#include "prototypes.h"
 
 /*
  * Get build materials from sector @sp.
diff --git a/src/lib/update/mobility.c b/src/lib/update/mobility.c
index 73330f6c..5b764187 100644
--- a/src/lib/update/mobility.c
+++ b/src/lib/update/mobility.c
@@ -34,12 +34,15 @@
 
 #include <config.h>
 
+#include "file.h"
 #include "game.h"
 #include "land.h"
+#include "optlist.h"
 #include "plane.h"
+#include "prototypes.h"
+#include "sect.h"
 #include "server.h"
 #include "ship.h"
-#include "update.h"
 
 static int do_upd_checking;
 
diff --git a/src/lib/update/move_sat.c b/src/lib/update/move_sat.c
index f54f5ebe..95690a06 100644
--- a/src/lib/update/move_sat.c
+++ b/src/lib/update/move_sat.c
@@ -33,9 +33,13 @@
 #include <config.h>
 
 #include <math.h>
+#include "file.h"
+#include "nat.h"
 #include "nsc.h"
+#include "optlist.h"
 #include "plane.h"
-#include "update.h"
+#include "prototypes.h"
+#include "sect.h"
 
 #ifndef PI
 #define PI	3.14159265358979323846
diff --git a/src/lib/update/nat.c b/src/lib/update/nat.c
index 5e7df696..ec31dec2 100644
--- a/src/lib/update/nat.c
+++ b/src/lib/update/nat.c
@@ -36,9 +36,12 @@
 
 #include <math.h>
 #include "budg.h"
+#include "file.h"
 #include "game.h"
 #include "item.h"
-#include "update.h"
+#include "optlist.h"
+#include "prototypes.h"
+#include "nat.h"
 
 /*
  * hap and edu avg mean that the weight on current happiness is
diff --git a/src/lib/update/nxtitemp.c b/src/lib/update/nxtitemp.c
index 83dff29d..dfd20ae7 100644
--- a/src/lib/update/nxtitemp.c
+++ b/src/lib/update/nxtitemp.c
@@ -33,11 +33,12 @@
 #include <config.h>
 
 #include "empobj.h"
+#include "file.h"
 #include "land.h"
 #include "nsc.h"
+#include "prototypes.h"
 #include "ship.h"
 #include "unit.h"
-#include "update.h"
 
 void *
 nxtitemp(struct nstr_item *np)
diff --git a/src/lib/update/plague.c b/src/lib/update/plague.c
index 9a272cfa..fcb79a44 100644
--- a/src/lib/update/plague.c
+++ b/src/lib/update/plague.c
@@ -34,11 +34,15 @@
 #include <config.h>
 
 #include "chance.h"
+#include "file.h"
 #include "item.h"
 #include "lost.h"
+#include "optlist.h"
+#include "nat.h"
 #include "news.h"
 #include "plague.h"
-#include "update.h"
+#include "prototypes.h"
+#include "sect.h"
 
 static int infect_people(struct natstr *, struct sctstr *);
 
diff --git a/src/lib/update/plane.c b/src/lib/update/plane.c
index d8fe4512..7c80e342 100644
--- a/src/lib/update/plane.c
+++ b/src/lib/update/plane.c
@@ -36,11 +36,15 @@
 
 #include "budg.h"
 #include "chance.h"
+#include "file.h"
 #include "lost.h"
+#include "nat.h"
+#include "optlist.h"
 #include "plane.h"
 #include "player.h"
+#include "prototypes.h"
+#include "sect.h"
 #include "ship.h"
-#include "update.h"
 
 static void planerepair(struct plnstr *, struct natstr *, struct bp *, int);
 static void upd_plane(struct plnstr *, int, struct natstr *, struct bp *, int);
diff --git a/src/lib/update/populace.c b/src/lib/update/populace.c
index 6c70497d..89f95046 100644
--- a/src/lib/update/populace.c
+++ b/src/lib/update/populace.c
@@ -34,8 +34,12 @@
 #include <config.h>
 
 #include "chance.h"
+#include "file.h"
 #include "lost.h"
-#include "update.h"
+#include "optlist.h"
+#include "prototypes.h"
+#include "nat.h"
+#include "sect.h"
 
 void
 populace(struct sctstr *sp, int etu)
diff --git a/src/lib/update/prepare.c b/src/lib/update/prepare.c
index 7146114d..3d6b6e68 100644
--- a/src/lib/update/prepare.c
+++ b/src/lib/update/prepare.c
@@ -37,11 +37,15 @@
 
 #include "budg.h"
 #include "chance.h"
+#include "file.h"
 #include "item.h"
 #include "land.h"
+#include "nat.h"
+#include "optlist.h"
 #include "player.h"
+#include "prototypes.h"
+#include "sect.h"
 #include "ship.h"
-#include "update.h"
 
 void
 prepare_sects(int etu)
diff --git a/src/lib/update/produce.c b/src/lib/update/produce.c
index 632668f8..a7d7bae9 100644
--- a/src/lib/update/produce.c
+++ b/src/lib/update/produce.c
@@ -34,9 +34,12 @@
 
 #include "budg.h"
 #include "chance.h"
+#include "nat.h"
+#include "optlist.h"
 #include "player.h"
 #include "product.h"
-#include "update.h"
+#include "prototypes.h"
+#include "sect.h"
 
 static void materials_charge(struct pchrstr *, short *, int);
 
diff --git a/src/lib/update/removewants.c b/src/lib/update/removewants.c
index b43581c2..eb04bf47 100644
--- a/src/lib/update/removewants.c
+++ b/src/lib/update/removewants.c
@@ -32,7 +32,9 @@
 
 #include <config.h>
 
-#include "update.h"
+#include "file.h"
+#include "nat.h"
+#include "prototypes.h"
 
 int
 update_removewants(void)
diff --git a/src/lib/update/revolt.c b/src/lib/update/revolt.c
index 75c2e824..bedfc96e 100644
--- a/src/lib/update/revolt.c
+++ b/src/lib/update/revolt.c
@@ -35,14 +35,17 @@
 #include <config.h>
 
 #include "chance.h"
+#include "file.h"
 #include "land.h"
 #include "lost.h"
+#include "nat.h"
 #include "news.h"
 #include "nsc.h"
 #include "nuke.h"
 #include "path.h"
 #include "plane.h"
-#include "update.h"
+#include "prototypes.h"
+#include "sect.h"
 
 static void take_casualties(struct sctstr *, int);
 static void lnd_dies_fighting_che(struct lndstr *);
diff --git a/src/lib/update/sect.c b/src/lib/update/sect.c
index 1f8b3c28..4412831c 100644
--- a/src/lib/update/sect.c
+++ b/src/lib/update/sect.c
@@ -36,13 +36,17 @@
 
 #include "budg.h"
 #include "chance.h"
+#include "file.h"
 #include "item.h"
 #include "land.h"
 #include "lost.h"
+#include "nat.h"
+#include "optlist.h"
 #include "path.h"
 #include "player.h"
+#include "prototypes.h"
+#include "sect.h"
 #include "ship.h"
-#include "update.h"
 
 double
 buildeff(struct sctstr *sp)
diff --git a/src/lib/update/ship.c b/src/lib/update/ship.c
index a54b0fdc..e2d5213b 100644
--- a/src/lib/update/ship.c
+++ b/src/lib/update/ship.c
@@ -38,14 +38,18 @@
 #include <math.h>
 #include "budg.h"
 #include "chance.h"
+#include "file.h"
 #include "land.h"
 #include "lost.h"
+#include "nat.h"
 #include "news.h"
+#include "optlist.h"
 #include "plague.h"
 #include "player.h"
 #include "product.h"
+#include "prototypes.h"
+#include "sect.h"
 #include "ship.h"
-#include "update.h"
 
 static void shiprepair(struct shpstr *, struct natstr *, struct bp *, int);
 static void upd_ship(struct shpstr *, int, struct natstr *, struct bp *, int);