+if test "x$enable_glx" != xno; then
+ if ! echo "$platforms" | grep -q 'x11'; then
+ AC_MSG_ERROR([Building GLX without the x11 platform is not supported])
+ fi
+fi
+
+if test x"$enable_dri3" = xyes; then
+ DEFINES="$DEFINES -DHAVE_DRI3"
+
+ dri3_modules="x11-xcb xcb >= $XCB_REQUIRED xcb-dri3 xcb-xfixes xcb-present xcb-sync xshmfence >= $XSHMFENCE_REQUIRED"
+ PKG_CHECK_MODULES([XCB_DRI3], [$dri3_modules])
+fi
+