Hey!
I'm trying to build 4.9 RC and I run make PLATFORM=ios but I get the following output+error:
```
% make PLATFORM=ios
"/Applications/Xcode.app/Contents/Developer/usr/bin/make" -f ./Makefile.ios CONFIG= all
/Applications/Xcode.app/Contents/Developer/usr/bin/gcc -no-cpp-precomp -fno-strict-aliasing -fwrapv -fno-common -DHAVE_CHICKEN_CONFIG_H -mno-thumb -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -arch armv7 -DC_ENABLE_PTABLES -c -Os -fomit-frame-pointer -DC_BUILDING_LIBCHICKEN library.c -o library-static.o -I. -I./
clang: warning: no such sysroot directory: '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk'
In file included from library.c:11:
./chicken.h:104:10: fatal error: 'ctype.h' file not found
#include <ctype.h>
^
1 error generated.
make[1]: *** [library-static.o] Error 1
make: *** [all] Error 2
```