PKG_CHECK_MODULES([X11], [x11], [:], [USE_X11="no"])
PKG_CHECK_MODULES([XEXT], [xext], [:], [USE_X11="no"])
PKG_CHECK_MODULES([XFIXES], [xfixes], [:], [USE_X11="no"])
+ PKG_CHECK_MODULES([XDAMAGE], [xdamage], [:], [USE_X11="no"])
if test "$USE_X11" = "yes"; then
AC_DEFINE([HAVE_VA_X11], [1], [Defined to 1 if VA/X11 API is built])
fi