/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/usr/include/tk.h:78:11: fatal error: 'X11/Xlib.h' file not found
# include <X11/Xlib.h>
^
1 error generated.
error: command 'cc' failed with exit status 1