diff --git a/apple/applemmu.h b/apple/applemmu.h
index 7695336..9c63ebb 100644
--- a/apple/applemmu.h
+++ b/apple/applemmu.h
@@ -3,7 +3,7 @@
 
 #include <stdlib.h>
 #include "appledisplay.h"
-#include "slot.h"
+#include "Slot.h"
 #include "mmu.h"
 
 // when we read a nondeterministic result, we return FLOATING. Maybe
diff --git a/apple/diskii.h b/apple/diskii.h
index faaae31..c060636 100644
--- a/apple/diskii.h
+++ b/apple/diskii.h
@@ -10,7 +10,7 @@
 
 #include "filemanager.h"
 #include "applemmu.h"
-#include "slot.h"
+#include "Slot.h"
 
 #include "RingBuffer.h"
 #include "nibutil.h"
diff --git a/apple/mockingboard.h b/apple/mockingboard.h
index 33b64aa..ed8987c 100644
--- a/apple/mockingboard.h
+++ b/apple/mockingboard.h
@@ -9,8 +9,8 @@
 #endif
 
 #include "applemmu.h"
-#include "slot.h"
-#include "SY6522.h"
+#include "Slot.h"
+#include "sy6522.h"
 
 class Mockingboard : public Slot {
  public:
diff --git a/apple/nibutil.h b/apple/nibutil.h
index 6d37cbc..64ad9c5 100644
--- a/apple/nibutil.h
+++ b/apple/nibutil.h
@@ -8,7 +8,7 @@
 #include <time.h>
 #endif
 
-#include "ringbuffer.h"
+#include "RingBuffer.h"
 
 #define NIBTRACKSIZE 0x1A00
 // Minimum viable nibblized sector size. With GAP bytes, could be much longer.
diff --git a/apple/parallelcard.h b/apple/parallelcard.h
index dd38177..196ca54 100644
--- a/apple/parallelcard.h
+++ b/apple/parallelcard.h
@@ -9,7 +9,7 @@
 #endif
 
 #include "applemmu.h"
-#include "slot.h"
+#include "Slot.h"
 
 class Fx80;
 
diff --git a/sdl/sdl-clock.h b/sdl/sdl-clock.h
index cc17bd8..3a803c5 100644
--- a/sdl/sdl-clock.h
+++ b/sdl/sdl-clock.h
@@ -4,7 +4,7 @@
 #include <stdint.h>
 #include <stdio.h>
 
-#include "slot.h"
+#include "Slot.h"
 #include "applemmu.h"
 
 class SDLClock : public Slot {
diff --git a/sdl/sdl-display.h b/sdl/sdl-display.h
index 0f4f68f..f53beee 100644
--- a/sdl/sdl-display.h
+++ b/sdl/sdl-display.h
@@ -3,9 +3,9 @@
 
 #include <stdlib.h>
 
-#include <SDL2/SDL.h>
-#include <SDL2/SDL_mutex.h>
-#include <SDL2/SDL_events.h>
+#include <SDL.h>
+#include <SDL_mutex.h>
+#include <SDL_events.h>
 
 #include "physicaldisplay.h"
 
diff --git a/sdl/sdl-keyboard.h b/sdl/sdl-keyboard.h
index f252152..ff78eab 100644
--- a/sdl/sdl-keyboard.h
+++ b/sdl/sdl-keyboard.h
@@ -4,7 +4,7 @@
 #include "physicalkeyboard.h"
 #include "vmkeyboard.h"
 
-#include <SDL2/SDL.h>
+#include <SDL.h>
 
 class SDLKeyboard : public PhysicalKeyboard {
  public:
diff --git a/sdl/sdl-printer.h b/sdl/sdl-printer.h
index 0399c94..60de69f 100644
--- a/sdl/sdl-printer.h
+++ b/sdl/sdl-printer.h
@@ -3,9 +3,9 @@
 
 #include <stdlib.h>
 
-#include <SDL2/SDL.h>
-#include <SDL2/SDL_mutex.h>
-#include <SDL2/SDL_events.h>
+#include <SDL.h>
+#include <SDL_mutex.h>
+#include <SDL_events.h>
 
 #include "physicalprinter.h"