+###############################################################################
+#
+# Check for the XINERAMA server extension.
+#
+###############################################################################
+
+have_xinerama=no
+with_xinerama_req=unspecified
+AC_ARG_WITH(xinerama-ext,
+[ --with-xinerama-ext Include support for the XINERAMA extension.],
+ [with_xinerama="$withval"; with_xinerama_req="$withval"],[with_xinerama=yes])
+
+HANDLE_X_PATH_ARG(with_xinerama, --with-xinerama-ext, XINERAMA)
+
+if test "$with_xinerama" = yes; then
+
+ # first check for Xinerama.h
+ AC_CHECK_X_HEADER(X11/extensions/Xinerama.h, [have_xinerama=yes],,
+ [#include <X11/Xlib.h>])
+
+ # if that succeeded, then check for the XINERAMA code in the libraries
+ if test "$have_xinerama" = yes; then
+
+ # first look in -lXext
+ have_xinerama=no
+ AC_CHECK_X_LIB(Xext, XineramaQueryScreens, [have_xinerama=yes], [true],
+ -lXext -lX11)
+
+ # if that failed, look in -lXinerama (this is where it is in XFree86 4.1.)
+ if test "$have_xinerama" = no; then
+ AC_CHECK_X_LIB(Xinerama, XineramaQueryScreens,
+ [have_xinerama=yes; XINERAMA_LIBS="-lXinerama"],
+ [true], -lXext -lX11)
+ fi
+ fi
+
+ # if that succeeded, then we've really got it.
+ if test "$have_xinerama" = yes; then
+ AC_DEFINE(HAVE_XINERAMA)
+ fi
+
+elif test "$with_xinerama" != no; then
+ echo "error: must be yes or no: --with-xinerama-ext=$with_xinerama"
+ exit 1
+fi
+
+
+###############################################################################
+#
+# Check for the XF86VMODE server extension (for virtual screens.)
+#
+###############################################################################
+
+have_xf86vmode=no
+with_xf86vmode_req=unspecified
+AC_ARG_WITH(xf86vmode-ext,
+[ --with-xf86vmode-ext Include support for XFree86 virtual screens.],
+ [with_xf86vmode="$withval"; with_xf86vmode_req="$withval"],
+ [with_xf86vmode=yes])
+
+HANDLE_X_PATH_ARG(with_xf86vmode, --with-xf86vmode-ext, xf86vmode)
+
+VIDMODE_LIBS=""
+
+if test "$with_xf86vmode" = yes; then
+
+ # first check for xf86vmode.h
+ AC_CHECK_X_HEADER(X11/extensions/xf86vmode.h, [have_xf86vmode=yes],,
+ [#include <X11/Xlib.h>])
+
+ # if that succeeded, then check for the -lXxf86vm
+ if test "$have_xf86vmode" = yes; then
+ have_xf86vmode=no
+ AC_CHECK_X_LIB(Xxf86vm, XF86VidModeGetViewPort,
+ [have_xf86vmode=yes;
+ VIDMODE_LIBS="-lXxf86vm";
+ SAVER_LIBS="$SAVER_LIBS $VIDMODE_LIBS"],
+ [true], -lXext -lX11)
+ fi
+
+ # if that succeeded, then we've really got it.
+ if test "$have_xf86vmode" = yes; then
+ AC_DEFINE(HAVE_XF86VMODE)
+ fi
+
+elif test "$with_xf86vmode" != no; then
+ echo "error: must be yes or no: --with-xf86vmode-ext=$with_xf86vmode"
+ exit 1
+fi
+
+
+###############################################################################
+#
+# Check for the XF86VMODE server extension (for gamma fading.)
+#
+###############################################################################
+
+have_xf86gamma=no
+have_xf86gamma_ramp=no
+with_xf86gamma_req=unspecified
+AC_ARG_WITH(xf86gamma-ext,
+[ --with-xf86gamma-ext Include support for XFree86 gamma fading.],
+ [with_xf86gamma="$withval"; with_xf86gamma_req="$withval"],
+ [with_xf86gamma=yes])
+
+HANDLE_X_PATH_ARG(with_xf86gamma, --with-xf86gamma-ext, xf86gamma)
+
+if test "$with_xf86gamma" = yes; then
+
+ # first check for xf86vmode.h, if we haven't already
+ if test "$have_xf86vmode" = yes; then
+ have_xf86gamma=yes
+ else
+ AC_CHECK_X_HEADER(X11/extensions/xf86vmode.h, [have_xf86gamma=yes],,
+ [#include <X11/Xlib.h>])
+ fi
+
+ # if that succeeded, then check for the -lXxf86vm
+ if test "$have_xf86gamma" = yes; then
+ have_xf86gamma=no
+ AC_CHECK_X_LIB(Xxf86vm, XF86VidModeSetGamma,
+ [have_xf86gamma=yes],
+ [true], -lXext -lX11)
+ fi
+
+ # check for the Ramp versions of the functions too.
+ if test "$have_xf86gamma" = yes; then
+ have_xf86gamma_ramp=no
+ AC_CHECK_X_LIB(Xxf86vm, XF86VidModeSetGammaRamp,
+ [have_xf86gamma_ramp=yes],
+ [true], -lXext -lX11)
+ fi
+
+ # if those tests succeeded, then we've really got the functions.
+ if test "$have_xf86gamma" = yes; then
+ AC_DEFINE(HAVE_XF86VMODE_GAMMA)
+ fi
+
+ if test "$have_xf86gamma_ramp" = yes; then
+ AC_DEFINE(HAVE_XF86VMODE_GAMMA_RAMP)
+ fi
+
+ # pull in the lib, if we haven't already
+ if test "$have_xf86gamma" = yes -a "$have_xf86vmode" = no; then
+ SAVER_LIBS="$SAVER_LIBS -lXxf86vm"
+ fi
+
+elif test "$with_xf86gamma" != no; then
+ echo "error: must be yes or no: --with-xf86gamma-ext=$with_xf86vmode"
+ exit 1
+fi
+
+
+###############################################################################
+#
+# Check for the RANDR (Resize and Rotate) server extension.