[gegl-gtk] Silence gcc warnings

[Massimo Valentini <mvalentini src gnome org>]

commit c00f1760bb7334be9019edd20a80de2fe44b8834
Author: Massimo Valentini <mvalentini src gnome org>
Date:   Sat Sep 3 17:19:34 2011 +0200

    Silence gcc warnings
    
    annoying on x86_64 where pointers are wider than int
    and conversions caused by implicit declarations might
    cause crash.

 examples/gegl-gtk-basic.c      |    1 +
 examples/gegl-gtk-display-op.c |    1 +
 operations/gegl-gtk-display.c  |    1 +
 tests/test-view.c              |    5 +++--
 4 files changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/examples/gegl-gtk-basic.c b/examples/gegl-gtk-basic.c
index ea7f3cb..1d970c2 100644
--- a/examples/gegl-gtk-basic.c
+++ b/examples/gegl-gtk-basic.c
@@ -17,6 +17,7 @@
  */
 
 #include <string.h>
+#include <stdlib.h>
 #include <glib.h>
 #include <gegl.h>
 #include <gtk/gtk.h>
diff --git a/examples/gegl-gtk-display-op.c b/examples/gegl-gtk-display-op.c
index f0bba61..903fd5c 100644
--- a/examples/gegl-gtk-display-op.c
+++ b/examples/gegl-gtk-display-op.c
@@ -17,6 +17,7 @@
  */
 
 #include <string.h>
+#include <stdlib.h>
 #include <glib.h>
 #include <gegl.h>
 
diff --git a/operations/gegl-gtk-display.c b/operations/gegl-gtk-display.c
index cf4804d..3bc41ca 100644
--- a/operations/gegl-gtk-display.c
+++ b/operations/gegl-gtk-display.c
@@ -98,6 +98,7 @@ set_window_attributes (GeglOperation *operation, const GeglRectangle *result)
         }
       else
         {
+          const gchar *gegl_node_get_debug_name (GeglNode *node);
           gtk_window_set_title (GTK_WINDOW (priv->window),
           gegl_node_get_debug_name (gegl_node_get_producer(operation->node, "input", NULL))
           );
diff --git a/tests/test-view.c b/tests/test-view.c
index e427668..5be1dff 100644
--- a/tests/test-view.c
+++ b/tests/test-view.c
@@ -3,10 +3,11 @@
 
 #include <gegl-gtk-view.h>
 #include <gegl.h>
+#include <string.h>
 
 gboolean
 test_utils_display_is_set () {
-  return g_getenv ("DISPLAY");
+  return g_getenv ("DISPLAY") != NULL;
 }
 
 void
@@ -212,7 +213,7 @@ main (int argc, char **argv) {
     /* Currently all tests depend on having a display server */
     if (!test_utils_display_is_set()) {
         g_printf("%s", "Warning: Skipping tests due to missing display server.\n");
-        exit(0);
+        return 0;
     }
 
     g_thread_init(NULL);