Activate the DPMS extension; avoid Ubuntu 11.10 crashing. 



git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4745 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/BUILDING.txt b/BUILDING.txt
index 000482d..044e7c4 100644
--- a/BUILDING.txt
+++ b/BUILDING.txt
@@ -160,7 +160,7 @@
     "17" for version 1.7.x.)
   > autoreconf -fiv
 
-  > ./configure --with-pic --without-dtrace --disable-static \
+  > ./configure --with-pic --without-dtrace --disable-static --disable-dri \
       --disable-xinerama --disable-xvfb --disable-xnest --disable-xorg \
       --disable-dmx --disable-xwin --disable-xephyr --disable-kdrive \
       --disable-config-dbus --disable-config-hal --disable-config-udev \