--- configure.ac.old	2011-04-03 18:40:26.773198667 +0200
+++ configure.ac	2011-04-03 18:41:52.586532001 +0200
@@ -55,6 +55,9 @@
 AC_ARG_WITH(libpng,
             AC_HELP_STRING([--without-libpng], [Do not use libpng.]),
             [], [with_libpng=yes])
+AC_ARG_WITH(dga,
+            AC_HELP_STRING([--without-dga], [Do not use dga.]),
+            [], [with_dga=yes])
 AC_ARG_WITH(gtk,
             AC_HELP_STRING([--without-gtk], [Do not use gtk.]),
             [], [with_gtk=yes])
@@ -262,11 +265,17 @@
 dnl ********************************************************************
 dnl Check for DGA (for v4l-conf)
 dnl ********************************************************************
-AC_SUBST(V4LCONF_LIBS)
-AC_CHECK_LIB(Xxf86dga, XF86DGAQueryExtension,
-	V4LCONF_LIBS="$X_LIBS -lXxf86dga" 
-	AC_DEFINE(HAVE_LIBXXF86DGA,1, [libxf86dga is present]),,
-	$X_LIBS $X_PRE_LIBS -lXext -lX11 $X_EXTRA_LIBS)
+have_dga=false
+if test x$with_dga != xno ; then
+  AC_SUBST(V4LCONF_LIBS)
+  AC_CHECK_LIB(Xxf86dga, XF86DGAQueryExtension,
+                    V4LCONF_LIBS="$X_LIBS -lXxf86dga"
+                    have_dga="true"
+                    AC_DEFINE(HAVE_LIBXXF86DGA,1, [libxf86dga is present]),
+                    have_dga="false",
+                    $X_LIBS $X_PRE_LIBS -lXext -lX11 $X_EXTRA_LIBS)
+fi
+AM_CONDITIONAL(HAVE_LIBXXF86DGA, test x$have_dga = xtrue)
 
 dnl ********************************************************************
 dnl Check for Gtk+/glib (for glav).  2.4.0 or greater required (should
@@ -602,6 +611,7 @@
   AC_MSG_NOTICE([  - extra_cflags added to CFLAGS: ${with_extra_cflags}])
 fi
 AC_MSG_NOTICE([  - video4linux recording/playback: ${have_video4linux}])
+AC_MSG_NOTICE([  - v4l-conf                      : ${have_dga}])
 AC_MSG_NOTICE([  - software MJPEG playback       : ${have_sdl}])
 AC_MSG_NOTICE([  - Quicktime playback/recording  : ${have_libquicktime}])
 AC_MSG_NOTICE([  - PNG input support             : ${have_libpng}])