[devhelp/wip/swilmet/misc-improvements] book-manager: include only glib-object.h in the header

[Sébastien Wilmet <swilmet src gnome org>]

commit c419ecf74681faa49d7004fba9360e4aa7a02d53
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun May 24 12:13:29 2015 +0200

    book-manager: include only glib-object.h in the header
    
    DhBookManager doesn't depend on GTK+. And the header doesn't need
    dh-book.h.
    
    With that change, fix compilation error in dh-preferences.c.

 src/dh-book-manager.h |    4 +---
 src/dh-preferences.c  |    4 +++-
 2 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/dh-book-manager.h b/src/dh-book-manager.h
index 148aded..453d7ad 100644
--- a/src/dh-book-manager.h
+++ b/src/dh-book-manager.h
@@ -19,9 +19,7 @@
 #ifndef __DH_BOOK_MANAGER_H__
 #define __DH_BOOK_MANAGER_H__
 
-#include <gtk/gtk.h>
-
-#include "dh-book.h"
+#include <glib-object.h>
 
 G_BEGIN_DECLS
 
diff --git a/src/dh-preferences.c b/src/dh-preferences.c
index 4e75655..dbac0cb 100644
--- a/src/dh-preferences.c
+++ b/src/dh-preferences.c
@@ -20,8 +20,10 @@
 
 #include "config.h"
 #include "dh-preferences.h"
-#include <gtk/gtk.h>
+
 #include <string.h>
+
+#include "dh-book.h"
 #include "dh-util.h"
 #include "dh-app.h"
 #include "dh-settings.h"