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diff --git a/configure.ac b/configure.ac
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index 903fb02..1a6b6bc 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -353,10 +353,8 @@ if test "$gtk_exists" != "no"; then
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     AC_RUN_IFELSE([AC_LANG_PROGRAM([
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 #include <stdlib.h>
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 #include <gtk/gtk.h>
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-
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-int
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-main (int argc, char **argv)
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-{
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+                                   ],
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+      [
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     GOptionGroup *option_group;
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     GOptionContext *option_context;
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     gchar *help;
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@@ -373,7 +371,6 @@ main (int argc, char **argv)
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     g_option_context_free(option_context);
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     return debug_mode ? EXIT_SUCCESS : EXIT_FAILURE;
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-}
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       ])],
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       [AC_DEFINE(HAVE_GTK_ENABLE_DEBUG, 1,
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 		 [Define to 1 if you have GTK+ installed and built with debug mode])