on second glance, there are even more issues that keep us from working w/2.4. still, 2.6 was released in 2004, so it's not like we're on the bleeding edge here.

configure.ac

@@ -5,8 +5,8 @@ AC_CONFIG_SRCDIR(libtransmission/transmission.h)
 AM_INIT_AUTOMAKE(AC_PACKAGE_NAME,AC_PACKAGE_VERSION)
 AM_MAINTAINER_MODE
 
-GLIB_MINIMUM=2.4.0
-GTK_MINIMUM=2.4.0
+GLIB_MINIMUM=2.6.0
+GTK_MINIMUM=2.6.0
 WX_MINIMUM=2.6.0
 AC_SUBST(GLIB_MINIMUM)
 AC_SUBST(GTK_MINIMUM)

gtk/actions.c

@@ -21,12 +21,6 @@
 #define UNUSED
 #endif
 
-#if !GTK_CHECK_VERSION(2,6,0)
-#define GTK_STOCK_ABOUT NULL
-#endif
-
-
-
 extern void doAction (const char * action_name, gpointer user_data );
 
 static GtkActionGroup * myGroup = 0;

gtk/hig.c

@@ -163,12 +163,6 @@ hig_message_dialog_set_text (GtkMessageDialog * dialog,
                              const char       * primary,
                              const char       * secondary)
 {
-#if GTK_CHECK_VERSION(2,6,0)
   gtk_message_dialog_set_markup (dialog, primary);
   gtk_message_dialog_format_secondary_text (dialog, "%s", secondary);
-#else
-  char * pch = g_strdup_printf ("<b>%s</b>\n \n%s", primary, secondary);
-  gtk_message_dialog_set_markup (dialog, pch);
-  g_free (pch);
-#endif
 }

gtk/main.c

@@ -888,8 +888,6 @@ getselection( struct cbdata * cbdata )
 static void
 about ( void )
 {
-#if GTK_CHECK_VERSION(2,6,0)
-
   GtkWidget * w = gtk_about_dialog_new ();
   GtkAboutDialog * a = GTK_ABOUT_DIALOG (w);
   const char *authors[] = { "Eric Petit (Back-end; OS X)",
@@ -909,23 +907,6 @@ about ( void )
   gtk_about_dialog_set_translator_credits (a, _("translator-credits"));
   g_signal_connect_swapped (w, "response", G_CALLBACK (gtk_widget_destroy), w);
   gtk_widget_show_all (w);
-
-#else
-
-  GtkWidget * w = gtk_message_dialog_new_with_markup(
-    NULL,
-    GTK_DIALOG_MODAL|GTK_DIALOG_DESTROY_WITH_PARENT,
-    GTK_MESSAGE_INFO,
-    GTK_BUTTONS_CLOSE,
-    "<b>%s %s</b>\n\n%s\n%s",
-    g_get_application_name(), LONG_VERSION_STRING,
-    "http://transmission.m0k.org/",
-    _("Copyright 2005-2007 The Transmission Project"));
-  g_signal_connect_swapped (w, "response",
-                            G_CALLBACK (gtk_widget_destroy), w);
-  gtk_widget_show_all( w );
-
-#endif
 }
 
 static void

gtk/torrent-inspector.c

@@ -39,11 +39,6 @@
 
 #define UPDATE_INTERVAL_MSEC 1500
 
-#if !GTK_CHECK_VERSION(2,6,0)
-#define GTK_STOCK_FILE NULL
-#define GTK_STOCK_DIRECTORY NULL
-#endif
-
 /****
 *****  PIECES VIEW
 ****/