+# Check for DRM (mandatory)
+LIBDRM_VERSION=libdrm_version
+PKG_CHECK_MODULES([DRM], [libdrm >= $LIBDRM_VERSION])
+AC_SUBST(LIBDRM_VERSION)
+
+USE_DRM="no"
+if test "$enable_drm" = "yes"; then
+ USE_DRM="yes"
+ AC_DEFINE([HAVE_VA_DRM], [1], [Defined to 1 if VA/DRM API is built])
+fi
+AM_CONDITIONAL(USE_DRM, test "$USE_DRM" = "yes")
+
+# Check for X11
+USE_X11="no"
+if test "$enable_x11" = "yes"; then
+ USE_X11="yes"
+ PKG_CHECK_MODULES([X11], [x11], [:], [USE_X11="no"])
+ PKG_CHECK_MODULES([XEXT], [xext], [:], [USE_X11="no"])
+ PKG_CHECK_MODULES([XFIXES], [xfixes], [:], [USE_X11="no"])
+ if test "$USE_X11" = "yes"; then
+ AC_DEFINE([HAVE_VA_X11], [1], [Defined to 1 if VA/X11 API is built])
+ fi
+fi
+AM_CONDITIONAL(USE_X11, test "$USE_X11" = "yes")
+
+# Check for GLX