--- rxvt-unicode/configure.ac	2012/06/10 13:07:56	1.143
+++ rxvt-unicode/configure.ac	2012/06/19 18:17:56	1.144
@@ -97,6 +97,7 @@
 support_iso14755=yes
 support_styles=yes
 support_perl=yes
+support_xdbe=yes
 codesets=all
 
 dnl# --------------------------------------------------------------------------
@@ -109,6 +110,7 @@
   [
     if test x$enableval = xno; then
        support_frills=no
+       support_xdbe=no
        support_inheritpixmap=no
        support_fading=no
        support_keepscrolling=no
@@ -133,6 +135,7 @@
        support_iso14755=no
        support_styles=no
        support_perl=no
+       support_xdbe=no
        codesets=
     fi
     if test x$enableval = xyes; then
@@ -161,6 +164,7 @@
        support_iso14755=yes
        support_styles=yes
        support_perl=yes
+       support_xdbe=yes
        codesets=all
     fi
   ])
@@ -412,6 +416,12 @@
     AC_DEFINE_UNQUOTED(RXVT_TERMINFO, "$withval", Set TERMINFO value to the value given by configure) terminfo="$withval"
   fi])
 
+AC_ARG_ENABLE(xdbe,
+              [  --enable-xdbe           enable support for double buffering],
+  [if test x$enableval = xyes -o x$enableval = xno; then
+    support_xdbe=$enableval
+  fi])
+
 dnl# --------------------------------------------------------------------------
 
 LIBEV_M4_AVOID_LIBRT=1
@@ -564,6 +574,10 @@
 if test x$support_inheritpixmap = xyes || test x$support_pixbuf = xyes; then
   support_image=yes
 fi
+if test x$support_xdbe = xyes; then
+  LIBS="$LIBS -lXext"
+fi
+
 if test x$support_xft = xyes || test x$support_image = xyes; then
   rxvt_have_xrender=no
   AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
@@ -648,6 +662,9 @@
 AC_SUBST(PIXBUF_CFLAGS)
 AC_SUBST(PIXBUF_LIBS)
 
+if test x$support_xdbe = xyes; then
+  AC_DEFINE(ENABLE_XDBE, 1, Define if you want to use XDBE)
+fi
 if test x$support_styles = xyes; then
   AC_DEFINE(ENABLE_STYLES, 1, Define if you want bold and italic support)
 fi