diff -Naur Thunar-1.8.0/configure Thunar-1.8.0-libxfce4ui-4.12/configure
--- Thunar-1.8.0/configure	2018-06-06 23:21:37.000000000 +0200
+++ Thunar-1.8.0-libxfce4ui-4.12/configure	2018-06-13 08:17:17.389481928 +0200
@@ -18140,9 +18140,9 @@
 
 
 
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for libxfce4ui-2 >= 4.13.2" >&5
-$as_echo_n "checking for libxfce4ui-2 >= 4.13.2... " >&6; }
-  if $PKG_CONFIG "--atleast-version=4.13.2" "libxfce4ui-2" >/dev/null 2>&1; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for libxfce4ui-2 >= 4.12.0" >&5
+$as_echo_n "checking for libxfce4ui-2 >= 4.12.0... " >&6; }
+  if $PKG_CONFIG "--atleast-version=4.12.0" "libxfce4ui-2" >/dev/null 2>&1; then
     LIBXFCE4UI_VERSION=`$PKG_CONFIG --modversion "libxfce4ui-2"`
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: $LIBXFCE4UI_VERSION" >&5
 $as_echo "$LIBXFCE4UI_VERSION" >&6; }
@@ -18159,7 +18159,7 @@
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: $LIBXFCE4UI_LIBS" >&5
 $as_echo "$LIBXFCE4UI_LIBS" >&6; }
 
-    LIBXFCE4UI_REQUIRED_VERSION=4.13.2
+    LIBXFCE4UI_REQUIRED_VERSION=4.12.0
 
 
 
@@ -18175,7 +18175,7 @@
 
       echo "*** The required package libxfce4ui-2 was found on your system,"
       echo "*** but the installed version ($xdt_cv_version) is too old."
-      echo "*** Please upgrade libxfce4ui-2 to atleast version 4.13.2, or adjust"
+      echo "*** Please upgrade libxfce4ui-2 to atleast version 4.12.0, or adjust"
       echo "*** the PKG_CONFIG_PATH environment variable if you installed"
       echo "*** the new version of the package in a nonstandard prefix so"
       echo "*** pkg-config is able to find it."
@@ -18187,7 +18187,7 @@
 
 
       echo "*** The required package libxfce4ui-2 was not found on your system."
-      echo "*** Please install libxfce4ui-2 (atleast version 4.13.2) or adjust"
+      echo "*** Please install libxfce4ui-2 (atleast version 4.12.0) or adjust"
       echo "*** the PKG_CONFIG_PATH environment variable if you"
       echo "*** installed the package in a nonstandard prefix so that"
       echo "*** pkg-config is able to find it."
diff -Naur Thunar-1.8.0/thunar/thunar-progress-dialog.c Thunar-1.8.0-libxfce4ui-4.12/thunar/thunar-progress-dialog.c
--- Thunar-1.8.0/thunar/thunar-progress-dialog.c	2018-06-06 21:44:27.000000000 +0200
+++ Thunar-1.8.0-libxfce4ui-4.12/thunar/thunar-progress-dialog.c	2018-06-13 08:15:17.703012100 +0200
@@ -24,8 +24,6 @@
 
 #include <gtk/gtk.h>
 
-#include <libxfce4ui/libxfce4ui.h>
-
 #include <thunar/thunar-private.h>
 #include <thunar/thunar-progress-dialog.h>
 #include <thunar/thunar-progress-view.h>
@@ -260,7 +258,7 @@
   if (n_views == SCROLLVIEW_THRESHOLD-1)
     {
       /* reparent the content box */
-      xfce_widget_reparent (dialog->content_box, dialog->vbox);
+      gtk_widget_reparent (dialog->content_box, dialog->vbox);
 
       /* destroy the scroll win */
       gtk_widget_destroy (dialog->scrollwin);
@@ -375,7 +373,7 @@
       gtk_widget_show (viewport);
 
       /* move the content box into the viewport */
-      xfce_widget_reparent (dialog->content_box, viewport);
+      gtk_widget_reparent (dialog->content_box, viewport);
     }
 
   g_signal_connect_swapped (view, "need-attention",