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/usr/include/X11/ShellI.h is in libxt-dev 1:1.1.1-2ubuntu0.1.

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#ifndef _XtShellInternal_h
#define _XtShellInternal_h

#include <X11/Xfuncproto.h>

_XFUNCPROTOBEGIN

extern void _XtShellGetCoordinates(Widget widget, Position *x, Position *y);

#endif /* _XtShellInternal_h */