/usr/include/libgnomecups-1/libgnomecups/gnome-cups-init.h is in libgnomecups1.0-dev 0.2.3-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #ifndef GNOME_CUPS_INIT
#define GNOME_CUPS_INIT
#include <glib/gtypes.h>
#include <glib/gmacros.h>
G_BEGIN_DECLS
typedef struct _GnomeCupsAuthContext GnomeCupsAuthContext;
typedef gboolean (*GnomeCupsAuthFunction) (const char *prompt,
char **username,
char **password,
GnomeCupsAuthContext *ctxt);
void gnome_cups_init (GnomeCupsAuthFunction opt_auth_fn);
void gnome_cups_shutdown (void);
G_END_DECLS
#endif
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