master 098add06eb7: Say whether we're using X11 double buffering

[Robert Pluim]

branch: master
commit 098add06eb7d742ff0e6ee0e294931a93a60c71c
Author: Robert Pluim <rpluim@gmail.com>
Commit: Robert Pluim <rpluim@gmail.com>

    Say whether we're using X11 double buffering
    
    * configure.ac (EMACS_CONFIG_FEATURES): Output value of HAVE_XDBE.
---
 configure.ac | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure.ac b/configure.ac
index c44165fb5c1..e1fcf1254df 100644
--- a/configure.ac
+++ b/configure.ac
@@ -6637,6 +6637,7 @@ AC_DEFINE_UNQUOTED([EMACS_CONFIG_FEATURES], 
["${emacs_config_features}"],
   [Summary of some of the main features enabled by configure.])
 
 AS_ECHO(["  Does Emacs use -lXaw3d?                                 
${HAVE_XAW3D}
+  Does Emacs use X11 double buffering?                    ${HAVE_XDBE}
   Does Emacs use -lXpm?                                   ${HAVE_XPM}
   Does Emacs use -ljpeg?                                  ${HAVE_JPEG}
   Does Emacs use -ltiff?                                  ${HAVE_TIFF}