diff --git a/os/macosx/Makefile b/os/macosx/Makefile
index 93acda4b24..0cd98d27f7 100644
--- a/os/macosx/Makefile
+++ b/os/macosx/Makefile
@@ -63,7 +63,6 @@ release: all
 	$(Q)cp docs/console.txt "OpenTTD $(REV)/docs/"
 	$(Q)cp COPYING "OpenTTD $(REV)/docs/"
 	$(Q)cp changelog.txt "OpenTTD $(REV)/docs/"
-	$(Q)cp docs/README_if_game_crashed_on_OSX.txt "OpenTTD $(REV)/docs/"
 	$(Q)cp os/macosx/*.webloc "OpenTTD $(REV)"
 	$(Q)cp known-bugs.txt "OpenTTD $(REV)/known-bugs.txt"
 	$(Q)cp scenario/* "OpenTTD $(REV)/scenario/"
diff --git a/stdafx.h b/stdafx.h
index 873b880a6f..e70215eca4 100644
--- a/stdafx.h
+++ b/stdafx.h
@@ -265,6 +265,9 @@ assert_compile(sizeof(uint8)  == 1);
 # define DrawString OTTD_DrawString
 # define Random OTTD_Random
 # define CloseConnection OTTD_CloseConnection
+
+// enable the preprocessor to tell the difference between different OSX versions
+# include <AvailabilityMacros.h>
 #endif /* __APPLE */
 
 #ifdef __AMIGA__