$NetBSD

Swap the Backspace and b key bindings.

--- xpdf/GlobalParams.cc.orig	2021-06-09 22:53:14.586298336 +0200
+++ xpdf/GlobalParams.cc
@@ -885,7 +885,7 @@ void GlobalParams::createDefaultKeyBindings() {
 				     "scrollToBottomRight"));
   keyBindings->append(new KeyBinding(xpdfKeyCodePgUp, xpdfKeyModNone,
 				     xpdfKeyContextAny, "pageUp"));
-  keyBindings->append(new KeyBinding(xpdfKeyCodeBackspace, xpdfKeyModNone,
+  keyBindings->append(new KeyBinding('b', xpdfKeyModNone,
 				     xpdfKeyContextAny, "pageUp"));
   keyBindings->append(new KeyBinding(xpdfKeyCodeDelete, xpdfKeyModNone,
 				     xpdfKeyContextAny, "pageUp"));
@@ -941,7 +941,7 @@ void GlobalParams::createDefaultKeyBindings() {
 				     "prevPageNoScroll"));
   keyBindings->append(new KeyBinding('v', xpdfKeyModNone,
 				     xpdfKeyContextAny, "goForward"));
-  keyBindings->append(new KeyBinding('b', xpdfKeyModNone,
+  keyBindings->append(new KeyBinding(xpdfKeyCodeBackspace, xpdfKeyModNone,
 				     xpdfKeyContextAny, "goBackward"));
   keyBindings->append(new KeyBinding('g', xpdfKeyModNone,
 				     xpdfKeyContextAny, "focusToPageNum"));