diff --git a/p2v/Makefile.am b/p2v/Makefile.am
index dfb338090..ef96f3422 100644
--- a/p2v/Makefile.am
+++ b/p2v/Makefile.am
@@ -77,6 +77,8 @@ virt_p2v_SOURCES = \
 	config.c \
 	conversion.c \
 	gui.c \
+	gui-gtk2-compat.h \
+	gui-gtk3-compat.h \
 	inhibit.c \
 	kernel.c \
 	kernel-cmdline.c \
diff --git a/p2v/gui-gtk2-compat.h b/p2v/gui-gtk2-compat.h
new file mode 100644
index 000000000..aa0512441
--- /dev/null
+++ b/p2v/gui-gtk2-compat.h
@@ -0,0 +1,117 @@
+/* virt-p2v
+ * Copyright (C) 2009-2017 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/* Backwards compatibility for ancient RHEL 5 Gtk 2.10. */
+#ifndef GTK_COMBO_BOX_TEXT
+#define GTK_COMBO_BOX_TEXT GTK_COMBO_BOX
+#define gtk_combo_box_text_new() gtk_combo_box_new_text()
+#define gtk_combo_box_text_append_text(combo, text)	\
+  gtk_combo_box_append_text((combo), (text))
+#define gtk_combo_box_text_get_active_text(combo)	\
+  gtk_combo_box_get_active_text((combo))
+#endif
+
+#if !GTK_CHECK_VERSION(2,12,0)	/* gtk < 2.12 */
+#define gtk_widget_set_tooltip_markup(widget, text) /* nothing */
+#endif
+
+#if !GTK_CHECK_VERSION(2,14,0)	/* gtk < 2.14 */
+#define gtk_dialog_get_content_area(dlg) ((dlg)->vbox)
+#endif
+
+#if !GTK_CHECK_VERSION(2,18,0)	/* gtk < 2.18 */
+static void
+gtk_cell_renderer_set_alignment (GtkCellRenderer *cell,
+                                 gfloat xalign, gfloat yalign)
+{
+  if ((xalign != cell->xalign) || (yalign != cell->yalign)) {
+    g_object_freeze_notify (G_OBJECT (cell));
+
+    if (xalign != cell->xalign) {
+      cell->xalign = xalign;
+      g_object_notify (G_OBJECT (cell), "xalign");
+    }
+
+    if (yalign != cell->yalign) {
+      cell->yalign = yalign;
+      g_object_notify (G_OBJECT (cell), "yalign");
+    }
+
+    g_object_thaw_notify (G_OBJECT (cell));
+  }
+}
+#endif
+
+#if !GTK_CHECK_VERSION(2,20,0)	/* gtk < 2.20 */
+typedef struct _ResponseData ResponseData;
+
+struct _ResponseData
+{
+  gint response_id;
+};
+
+static void
+response_data_free (gpointer data)
+{
+  g_slice_free (ResponseData, data);
+}
+
+static ResponseData *
+get_response_data (GtkWidget *widget, gboolean create)
+{
+  ResponseData *ad = g_object_get_data (G_OBJECT (widget),
+                                        "gtk-dialog-response-data");
+
+  if (ad == NULL && create) {
+    ad = g_slice_new (ResponseData);
+
+    g_object_set_data_full (G_OBJECT (widget),
+			    g_intern_static_string ("gtk-dialog-response-data"),
+			    ad,
+			    response_data_free);
+  }
+
+  return ad;
+}
+
+static GtkWidget *
+gtk_dialog_get_widget_for_response (GtkDialog *dialog, gint response_id)
+{
+  GList *children;
+  GList *tmp_list;
+
+  children = gtk_container_get_children (GTK_CONTAINER (dialog->action_area));
+
+  tmp_list = children;
+  while (tmp_list != NULL) {
+    GtkWidget *widget = tmp_list->data;
+    ResponseData *rd = get_response_data (widget, FALSE);
+
+    if (rd && rd->response_id == response_id) {
+      g_list_free (children);
+      return widget;
+    }
+
+    tmp_list = tmp_list->next;
+  }
+
+  g_list_free (children);
+
+  return NULL;
+}
+#endif /* gtk < 2.20 */
diff --git a/p2v/gui-gtk3-compat.h b/p2v/gui-gtk3-compat.h
new file mode 100644
index 000000000..b8539b798
--- /dev/null
+++ b/p2v/gui-gtk3-compat.h
@@ -0,0 +1,115 @@
+/* virt-p2v
+ * Copyright (C) 2009-2017 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/* Backwards compatibility for some deprecated functions in Gtk 3. */
+#if GTK_CHECK_VERSION(3,2,0)   /* gtk >= 3.2 */
+#define hbox_new(box, homogeneous, spacing)                    \
+  do {                                                         \
+    (box) = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, spacing); \
+    if (homogeneous)                                           \
+      gtk_box_set_homogeneous (GTK_BOX (box), TRUE);           \
+  } while (0)
+#define vbox_new(box, homogeneous, spacing)                    \
+  do {                                                         \
+    (box) = gtk_box_new (GTK_ORIENTATION_VERTICAL, spacing);   \
+    if (homogeneous)                                           \
+      gtk_box_set_homogeneous (GTK_BOX (box), TRUE);           \
+  } while (0)
+#else /* gtk < 3.2 */
+#define hbox_new(box, homogeneous, spacing)             \
+  (box) = gtk_hbox_new ((homogeneous), (spacing))
+#define vbox_new(box, homogeneous, spacing)             \
+  (box) = gtk_vbox_new ((homogeneous), (spacing))
+#endif
+
+#if GTK_CHECK_VERSION(3,4,0)   /* gtk >= 3.4 */
+/* GtkGrid is sufficiently similar to GtkTable that we can just
+ * redefine these functions.
+ */
+#define table_new(grid, rows, columns)          \
+  (grid) = gtk_grid_new ()
+#define table_attach(grid, child, left, right, top, bottom, xoptions, yoptions, xpadding, ypadding) \
+  do {                                                                  \
+    if (((xoptions) & GTK_EXPAND) != 0)                                 \
+      gtk_widget_set_hexpand ((child), TRUE);                           \
+    if (((xoptions) & GTK_FILL) != 0)                                   \
+      gtk_widget_set_halign ((child), GTK_ALIGN_FILL);                  \
+    if (((yoptions) & GTK_EXPAND) != 0)                                 \
+      gtk_widget_set_vexpand ((child), TRUE);                           \
+    if (((yoptions) & GTK_FILL) != 0)                                   \
+      gtk_widget_set_valign ((child), GTK_ALIGN_FILL);                  \
+    set_padding ((child), (xpadding), (ypadding));                      \
+    gtk_grid_attach (GTK_GRID (grid), (child),                          \
+                     (left), (top), (right)-(left), (bottom)-(top));    \
+  } while (0)
+#else
+#define table_new(table, rows, columns)                 \
+  (table) = gtk_table_new ((rows), (columns), FALSE)
+#define table_attach(table, child, left, right,top, bottom, xoptions, yoptions, xpadding, ypadding) \
+  gtk_table_attach (GTK_TABLE (table), (child),                         \
+                    (left), (right), (top), (bottom),                   \
+                    (xoptions), (yoptions), (xpadding), (ypadding))
+#endif
+
+#if GTK_CHECK_VERSION(3,8,0)   /* gtk >= 3.8 */
+#define scrolled_window_add_with_viewport(container, child)     \
+  gtk_container_add (GTK_CONTAINER (container), child)
+#else
+#define scrolled_window_add_with_viewport(container, child)             \
+  gtk_scrolled_window_add_with_viewport (GTK_SCROLLED_WINDOW (container), child)
+#endif
+
+#if GTK_CHECK_VERSION(3,10,0)   /* gtk >= 3.10 */
+#undef GTK_STOCK_DIALOG_WARNING
+#define GTK_STOCK_DIALOG_WARNING "dialog-warning"
+#define gtk_image_new_from_stock gtk_image_new_from_icon_name
+#endif
+
+#if GTK_CHECK_VERSION(3,14,0)   /* gtk >= 3.14 */
+#define set_padding(widget, xpad, ypad)                               \
+  do {                                                                \
+    if ((xpad) != 0) {                                                \
+      gtk_widget_set_margin_start ((widget), (xpad));                 \
+      gtk_widget_set_margin_end ((widget), (xpad));                   \
+    }                                                                 \
+    if ((ypad) != 0) {                                                \
+      gtk_widget_set_margin_top ((widget), (ypad));                   \
+      gtk_widget_set_margin_bottom ((widget), (ypad));                \
+    }                                                                 \
+  } while (0)
+#define set_alignment(widget, xalign, yalign)                   \
+  do {                                                          \
+    if ((xalign) == 0.)                                         \
+      gtk_widget_set_halign ((widget), GTK_ALIGN_START);        \
+    else if ((xalign) == 1.)                                    \
+      gtk_widget_set_halign ((widget), GTK_ALIGN_END);          \
+    else                                                        \
+      gtk_widget_set_halign ((widget), GTK_ALIGN_CENTER);       \
+    if ((yalign) == 0.)                                         \
+      gtk_widget_set_valign ((widget), GTK_ALIGN_START);        \
+    else if ((xalign) == 1.)                                    \
+      gtk_widget_set_valign ((widget), GTK_ALIGN_END);          \
+    else                                                        \
+      gtk_widget_set_valign ((widget), GTK_ALIGN_CENTER);       \
+  } while (0)
+#else  /* gtk < 3.14 */
+#define set_padding(widget, xpad, ypad)                 \
+  gtk_misc_set_padding(GTK_MISC(widget),(xpad),(ypad))
+#define set_alignment(widget, xalign, yalign)                   \
+  gtk_misc_set_alignment(GTK_MISC(widget),(xalign),(yalign))
+#endif
diff --git a/p2v/gui.c b/p2v/gui.c
index 226a68ee1..b850b2f10 100644
--- a/p2v/gui.c
+++ b/p2v/gui.c
@@ -47,6 +47,13 @@
  * Note that the other major dialog (C<"Configure network ...">) is
  * handled entirely by NetworkManager's L<nm-connection-editor(1)>
  * program and has nothing to do with this code.
+ *
+ * This file is written in a kind of "pseudo-Gtk" which is backwards
+ * compatible from Gtk 2.10 (RHEL 5) through at least Gtk 3.22.  This
+ * is done using a few macros to implement old C<gtk_*> functions or
+ * map them to newer functions.  Supporting ancient Gtk is important
+ * because we want to provide a virt-p2v binary that can run on very
+ * old kernels, to support 32 bit and proprietary SCSI drivers.
  */
 
 #include <config.h>
@@ -80,6 +87,10 @@
 
 #include "p2v.h"
 
+/* See note about "pseudo-Gtk" above. */
+#include "gui-gtk2-compat.h"
+#include "gui-gtk3-compat.h"
+
 /* Maximum vCPUs and guest memory that we will allow users to set.
  * These limits come from
  * https://access.redhat.com/articles/rhel-kvm-limits
@@ -87,204 +98,6 @@
 #define MAX_SUPPORTED_VCPUS 160
 #define MAX_SUPPORTED_MEMORY_MB (UINT64_C (4000 * 1024))
 
-/* Backwards compatibility for ancient RHEL 5 Gtk 2.10. */
-#ifndef GTK_COMBO_BOX_TEXT
-#define GTK_COMBO_BOX_TEXT GTK_COMBO_BOX
-#define gtk_combo_box_text_new() gtk_combo_box_new_text()
-#define gtk_combo_box_text_append_text(combo, text)	\
-  gtk_combo_box_append_text((combo), (text))
-#define gtk_combo_box_text_get_active_text(combo)	\
-  gtk_combo_box_get_active_text((combo))
-#endif
-
-#if !GTK_CHECK_VERSION(2,12,0)	/* gtk < 2.12 */
-#define gtk_widget_set_tooltip_markup(widget, text) /* nothing */
-#endif
-
-#if !GTK_CHECK_VERSION(2,14,0)	/* gtk < 2.14 */
-#define gtk_dialog_get_content_area(dlg) ((dlg)->vbox)
-#endif
-
-#if !GTK_CHECK_VERSION(2,18,0)	/* gtk < 2.18 */
-static void
-gtk_cell_renderer_set_alignment (GtkCellRenderer *cell,
-                                 gfloat xalign, gfloat yalign)
-{
-  if ((xalign != cell->xalign) || (yalign != cell->yalign)) {
-    g_object_freeze_notify (G_OBJECT (cell));
-
-    if (xalign != cell->xalign) {
-      cell->xalign = xalign;
-      g_object_notify (G_OBJECT (cell), "xalign");
-    }
-
-    if (yalign != cell->yalign) {
-      cell->yalign = yalign;
-      g_object_notify (G_OBJECT (cell), "yalign");
-    }
-
-    g_object_thaw_notify (G_OBJECT (cell));
-  }
-}
-#endif
-
-#if !GTK_CHECK_VERSION(2,20,0)	/* gtk < 2.20 */
-typedef struct _ResponseData ResponseData;
-
-struct _ResponseData
-{
-  gint response_id;
-};
-
-static void
-response_data_free (gpointer data)
-{
-  g_slice_free (ResponseData, data);
-}
-
-static ResponseData *
-get_response_data (GtkWidget *widget, gboolean create)
-{
-  ResponseData *ad = g_object_get_data (G_OBJECT (widget),
-                                        "gtk-dialog-response-data");
-
-  if (ad == NULL && create) {
-    ad = g_slice_new (ResponseData);
-
-    g_object_set_data_full (G_OBJECT (widget),
-			    g_intern_static_string ("gtk-dialog-response-data"),
-			    ad,
-			    response_data_free);
-  }
-
-  return ad;
-}
-
-static GtkWidget *
-gtk_dialog_get_widget_for_response (GtkDialog *dialog, gint response_id)
-{
-  GList *children;
-  GList *tmp_list;
-
-  children = gtk_container_get_children (GTK_CONTAINER (dialog->action_area));
-
-  tmp_list = children;
-  while (tmp_list != NULL) {
-    GtkWidget *widget = tmp_list->data;
-    ResponseData *rd = get_response_data (widget, FALSE);
-
-    if (rd && rd->response_id == response_id) {
-      g_list_free (children);
-      return widget;
-    }
-
-    tmp_list = tmp_list->next;
-  }
-
-  g_list_free (children);
-
-  return NULL;
-}
-#endif /* gtk < 2.20 */
-
-/* Backwards compatibility for some deprecated functions in Gtk 3. */
-#if GTK_CHECK_VERSION(3,2,0)   /* gtk >= 3.2 */
-#define hbox_new(box, homogeneous, spacing)                    \
-  do {                                                         \
-    (box) = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, spacing); \
-    if (homogeneous)                                           \
-      gtk_box_set_homogeneous (GTK_BOX (box), TRUE);           \
-  } while (0)
-#define vbox_new(box, homogeneous, spacing)                    \
-  do {                                                         \
-    (box) = gtk_box_new (GTK_ORIENTATION_VERTICAL, spacing);   \
-    if (homogeneous)                                           \
-      gtk_box_set_homogeneous (GTK_BOX (box), TRUE);           \
-  } while (0)
-#else /* gtk < 3.2 */
-#define hbox_new(box, homogeneous, spacing)             \
-  (box) = gtk_hbox_new ((homogeneous), (spacing))
-#define vbox_new(box, homogeneous, spacing)             \
-  (box) = gtk_vbox_new ((homogeneous), (spacing))
-#endif
-
-#if GTK_CHECK_VERSION(3,4,0)   /* gtk >= 3.4 */
-/* GtkGrid is sufficiently similar to GtkTable that we can just
- * redefine these functions.
- */
-#define table_new(grid, rows, columns)          \
-  (grid) = gtk_grid_new ()
-#define table_attach(grid, child, left, right, top, bottom, xoptions, yoptions, xpadding, ypadding) \
-  do {                                                                  \
-    if (((xoptions) & GTK_EXPAND) != 0)                                 \
-      gtk_widget_set_hexpand ((child), TRUE);                           \
-    if (((xoptions) & GTK_FILL) != 0)                                   \
-      gtk_widget_set_halign ((child), GTK_ALIGN_FILL);                  \
-    if (((yoptions) & GTK_EXPAND) != 0)                                 \
-      gtk_widget_set_vexpand ((child), TRUE);                           \
-    if (((yoptions) & GTK_FILL) != 0)                                   \
-      gtk_widget_set_valign ((child), GTK_ALIGN_FILL);                  \
-    set_padding ((child), (xpadding), (ypadding));                      \
-    gtk_grid_attach (GTK_GRID (grid), (child),                          \
-                     (left), (top), (right)-(left), (bottom)-(top));    \
-  } while (0)
-#else
-#define table_new(table, rows, columns)                 \
-  (table) = gtk_table_new ((rows), (columns), FALSE)
-#define table_attach(table, child, left, right,top, bottom, xoptions, yoptions, xpadding, ypadding) \
-  gtk_table_attach (GTK_TABLE (table), (child),                         \
-                    (left), (right), (top), (bottom),                   \
-                    (xoptions), (yoptions), (xpadding), (ypadding))
-#endif
-
-#if GTK_CHECK_VERSION(3,8,0)   /* gtk >= 3.8 */
-#define scrolled_window_add_with_viewport(container, child)     \
-  gtk_container_add (GTK_CONTAINER (container), child)
-#else
-#define scrolled_window_add_with_viewport(container, child)             \
-  gtk_scrolled_window_add_with_viewport (GTK_SCROLLED_WINDOW (container), child)
-#endif
-
-#if GTK_CHECK_VERSION(3,10,0)   /* gtk >= 3.10 */
-#undef GTK_STOCK_DIALOG_WARNING
-#define GTK_STOCK_DIALOG_WARNING "dialog-warning"
-#define gtk_image_new_from_stock gtk_image_new_from_icon_name
-#endif
-
-#if GTK_CHECK_VERSION(3,14,0)   /* gtk >= 3.14 */
-#define set_padding(widget, xpad, ypad)                               \
-  do {                                                                \
-    if ((xpad) != 0) {                                                \
-      gtk_widget_set_margin_start ((widget), (xpad));                 \
-      gtk_widget_set_margin_end ((widget), (xpad));                   \
-    }                                                                 \
-    if ((ypad) != 0) {                                                \
-      gtk_widget_set_margin_top ((widget), (ypad));                   \
-      gtk_widget_set_margin_bottom ((widget), (ypad));                \
-    }                                                                 \
-  } while (0)
-#define set_alignment(widget, xalign, yalign)                   \
-  do {                                                          \
-    if ((xalign) == 0.)                                         \
-      gtk_widget_set_halign ((widget), GTK_ALIGN_START);        \
-    else if ((xalign) == 1.)                                    \
-      gtk_widget_set_halign ((widget), GTK_ALIGN_END);          \
-    else                                                        \
-      gtk_widget_set_halign ((widget), GTK_ALIGN_CENTER);       \
-    if ((yalign) == 0.)                                         \
-      gtk_widget_set_valign ((widget), GTK_ALIGN_START);        \
-    else if ((xalign) == 1.)                                    \
-      gtk_widget_set_valign ((widget), GTK_ALIGN_END);          \
-    else                                                        \
-      gtk_widget_set_valign ((widget), GTK_ALIGN_CENTER);       \
-  } while (0)
-#else  /* gtk < 3.14 */
-#define set_padding(widget, xpad, ypad)                 \
-  gtk_misc_set_padding(GTK_MISC(widget),(xpad),(ypad))
-#define set_alignment(widget, xalign, yalign)                   \
-  gtk_misc_set_alignment(GTK_MISC(widget),(xalign),(yalign))
-#endif
-
 static void create_connection_dialog (struct config *);
 static void create_conversion_dialog (struct config *);
 static void create_running_dialog (void);