Mavericks and PIL installation is missing

I don't know much about it, so it's just an overview.

$ sudo pip install PIL

The following error log.

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/usr/clude/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

When I updated my Mac to Marvericks, the Python library was missing, so when I reinserted it, PIL did not enter in this situation.

I found a lot of googles stack overflow around here

$ xcode-select --install

It's okay if you do it after that.

I see. The command line tool of Xcode may disappear when the OS is updated. So if you put it back in, it will be okay.