diff --git a/src/graph_gui.cpp b/src/graph_gui.cpp
--- a/src/graph_gui.cpp
+++ b/src/graph_gui.cpp
@@ -29,7 +29,6 @@
 
 #include "table/strings.h"
 #include "table/sprites.h"
-#include <math.h>
 
 #include "safeguards.h"
 
diff --git a/src/mixer.cpp b/src/mixer.cpp
--- a/src/mixer.cpp
+++ b/src/mixer.cpp
@@ -8,7 +8,6 @@
 /** @file mixer.cpp Mixing of sound samples. */
 
 #include "stdafx.h"
-#include <math.h>
 #include <mutex>
 #include <atomic>
 #include "core/math_func.hpp"
diff --git a/src/music/extmidi.cpp b/src/music/extmidi.cpp
--- a/src/music/extmidi.cpp
+++ b/src/music/extmidi.cpp
@@ -24,7 +24,6 @@
 #include <unistd.h>
 #include <signal.h>
 #include <sys/stat.h>
-#include <errno.h>
 
 #include "../safeguards.h"
 
diff --git a/src/os/macosx/crashlog_osx.cpp b/src/os/macosx/crashlog_osx.cpp
--- a/src/os/macosx/crashlog_osx.cpp
+++ b/src/os/macosx/crashlog_osx.cpp
@@ -15,7 +15,6 @@
 #include "../../video/video_driver.hpp"
 #include "macos.h"
 
-#include <errno.h>
 #include <signal.h>
 #include <mach-o/arch.h>
 #include <dlfcn.h>
diff --git a/src/os/os2/os2.cpp b/src/os/os2/os2.cpp
--- a/src/os/os2/os2.cpp
+++ b/src/os/os2/os2.cpp
@@ -21,7 +21,6 @@
 #include <dirent.h>
 #include <unistd.h>
 #include <sys/stat.h>
-#include <stdlib.h>
 #include <time.h>
 #ifndef __INNOTEK_LIBC__
 #	include <dos.h>
diff --git a/src/os/os2/os2_main.cpp b/src/os/os2/os2_main.cpp
--- a/src/os/os2/os2_main.cpp
+++ b/src/os/os2/os2_main.cpp
@@ -12,7 +12,6 @@
 #include "../../core/random_func.hpp"
 #include "../../string_func.h"
 
-#include <stdlib.h>
 #include <time.h>
 
 #include "../../safeguards.h"
diff --git a/src/os/unix/crashlog_unix.cpp b/src/os/unix/crashlog_unix.cpp
--- a/src/os/unix/crashlog_unix.cpp
+++ b/src/os/unix/crashlog_unix.cpp
@@ -13,7 +13,6 @@
 #include "../../gamelog.h"
 #include "../../saveload/saveload.h"
 
-#include <errno.h>
 #include <signal.h>
 #include <sys/utsname.h>
 
diff --git a/src/os/unix/unix.cpp b/src/os/unix/unix.cpp
--- a/src/os/unix/unix.cpp
+++ b/src/os/unix/unix.cpp
@@ -108,7 +108,6 @@ bool FiosIsHiddenFile(const struct diren
 #ifdef WITH_ICONV
 
 #include <iconv.h>
-#include <errno.h>
 #include "../../debug.h"
 #include "../../string_func.h"
 
diff --git a/src/os/windows/win32.cpp b/src/os/windows/win32.cpp
--- a/src/os/windows/win32.cpp
+++ b/src/os/windows/win32.cpp
@@ -23,7 +23,6 @@
 #include "../../fios.h"
 #include "../../core/alloc_func.hpp"
 #include "../../string_func.h"
-#include <errno.h>
 #include <sys/stat.h>
 #include "../../language.h"
 #include "../../thread.h"
diff --git a/src/script/api/script_industry.cpp b/src/script/api/script_industry.cpp
--- a/src/script/api/script_industry.cpp
+++ b/src/script/api/script_industry.cpp
@@ -22,7 +22,6 @@
 #include "../../industry_cmd.h"
 #include "../../timer/timer_game_calendar.h"
 #include "table/strings.h"
-#include <numeric>
 
 #include "../../safeguards.h"
 
diff --git a/src/story_gui.cpp b/src/story_gui.cpp
--- a/src/story_gui.cpp
+++ b/src/story_gui.cpp
@@ -31,8 +31,6 @@
 #include "table/strings.h"
 #include "table/sprites.h"
 
-#include <numeric>
-
 #include "safeguards.h"
 
 static CursorID TranslateStoryPageButtonCursor(StoryPageButtonCursor cursor);
diff --git a/src/tgp.cpp b/src/tgp.cpp
--- a/src/tgp.cpp
+++ b/src/tgp.cpp
@@ -8,7 +8,6 @@
 /** @file tgp.cpp OTTD Perlin Noise Landscape Generator, aka TerraGenesis Perlin */
 
 #include "stdafx.h"
-#include <math.h>
 #include "clear_map.h"
 #include "void_map.h"
 #include "genworld.h"
diff --git a/src/vehicle_gui_base.h b/src/vehicle_gui_base.h
--- a/src/vehicle_gui_base.h
+++ b/src/vehicle_gui_base.h
@@ -19,8 +19,6 @@
 #include "window_gui.h"
 #include "widgets/dropdown_type.h"
 
-#include <numeric>
-
 typedef GUIList<const Vehicle*, CargoID> GUIVehicleList;
 
 struct GUIVehicleGroup {
diff --git a/src/video/opengl.cpp b/src/video/opengl.cpp
--- a/src/video/opengl.cpp
+++ b/src/video/opengl.cpp
@@ -36,7 +36,6 @@
 #include "../debug.h"
 #include "../blitter/factory.hpp"
 #include "../zoom_func.h"
-#include <numeric>
 
 #include "../table/opengl_shader.h"
 #include "../table/sprites.h"