+###############################################################################
+#
+# 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=$with_xf86vmode"
+ exit 1
+fi
+
+
+###############################################################################
+#
+# Check for the RANDR (Resize and Rotate) server extension.
+#
+# We need this to detect when the resolution of the desktop
+# has changed out from under us (this is a newer, different
+# mechanism than the XF86VMODE virtual viewports.)
+#
+###############################################################################
+
+have_randr=no
+with_randr_req=unspecified
+AC_ARG_WITH(randr-ext,
+[ --with-randr-ext Include support for the X Resize+Rotate extension.],
+ [with_randr="$withval"; with_randr_req="$withval"],[with_randr=yes])
+
+HANDLE_X_PATH_ARG(with_randr, --with-randr-ext, RANDR)
+
+if test "$with_randr" = yes; then
+
+ # first check for Randr.h
+ AC_CHECK_X_HEADER(X11/extensions/Xrandr.h, [have_randr=yes],,
+ [#include <X11/Xlib.h>])
+
+ # if that succeeded, then check for the XRR code in the libraries
+ if test "$have_randr" = yes; then
+
+ # RANDR probably needs -lXrender
+ xrender_libs=
+ AC_CHECK_X_LIB(Xrender, XRenderSetSubpixelOrder,
+ [xrender_libs="-lXrender"], [true], -lXext -lX11)
+
+ # first look for RANDR in -lXext
+ have_randr=no
+ AC_CHECK_X_LIB(Xext, XRRGetScreenInfo,
+ [have_randr=yes; SAVER_LIBS="$SAVER_LIBS $xrender_libs"],
+ [true], $xrender_libs -lXext -lX11)
+
+ # if that failed, look in -lXrandr
+ if test "$have_randr" = no; then
+ AC_CHECK_X_LIB(Xrandr, XRRGetScreenInfo,
+ [have_randr=yes; SAVER_LIBS="$SAVER_LIBS -lXrandr $xrender_libs"],
+ [true], $xrender_libs -lXext -lX11)
+ fi
+ fi
+
+ # if that succeeded, then we've really got it.
+ if test "$have_randr" = yes; then
+ AC_DEFINE(HAVE_RANDR)
+ fi
+
+elif test "$with_randr" != no; then
+ echo "error: must be yes or no: --with-randr-ext=$with_randr"
+ exit 1
+fi
+
+
+###############################################################################
+#
+# Check for XF86MiscSetGrabKeysState (but only bother if we are already
+# using other XF86 stuff.)
+#
+###############################################################################
+
+have_xf86miscsetgrabkeysstate=no
+if test "$have_xf86gamma" = yes -o "$have_xf86vmode" = yes; then
+ AC_CHECK_X_LIB(Xxf86misc, XF86MiscSetGrabKeysState,
+ [have_xf86miscsetgrabkeysstate=yes],
+ [true], -lXext -lX11)
+ if test "$have_xf86miscsetgrabkeysstate" = yes ; then
+ SAVER_LIBS="$SAVER_LIBS -lXxf86misc"
+ AC_DEFINE(HAVE_XF86MISCSETGRABKEYSSTATE)
+ fi
+fi
+
+