Thread: warning i've never seen

Code:

warning: assignment discards qualifiers from pointer target type

I got this warning with gtk

Code:

 - Function: gchar* gtk_entry_get_text (GtkEntry *ENTRY)
     Returns the text that is contained in the `GtkEntry' as a pointer
     to a `gchar' variable.

here is my code

Code:

gchar *input;
.
.
.
input=gtk_entry_get_text(GTK_ENTRY(GTK_COMBO(combo)->entry));

what does this mean?
Thanks