diff --git a/conf/ros-distro/include/dashing/ros-distro-recipe-blacklist.inc b/conf/ros-distro/include/dashing/ros-distro-recipe-blacklist.inc
index 83976ef..a31ae08 100644
--- a/conf/ros-distro/include/dashing/ros-distro-recipe-blacklist.inc
+++ b/conf/ros-distro/include/dashing/ros-distro-recipe-blacklist.inc
@@ -14,3 +14,21 @@ PNBLACKLIST[packagegroup-ros1-kobuki] ?= "Not a ROS 2 package"
 # Initially, blacklist any non-platform recipes with multiple versions found by "bitbake-layers show-recipes --multiple". Remove
 # from the blacklist once a PREFERRED_VERSION_<PN> setting is made in ros-distro-preferred-versions.inc .
 # (none)
+
+#
+# Alternative implementations not yet supported.
+#
+PNBLACKLIST[connext-cmake-module] ?= "Not yet supporting use of Connext"
+PNBLACKLIST[rmw-connext-cpp] ?= "Not yet supporting use of Connext"
+PNBLACKLIST[rmw-connext-shared-cpp] ?= "Not yet supporting use of Connext"
+PNBLACKLIST[rosidl-typesupport-connext-c] ?= "Not yet supporting use of Connext"
+PNBLACKLIST[rosidl-typesupport-connext-cpp] ?= "Not yet supporting use of Connext"
+
+ROS_SUPERFLORE_GENERATED_WORLD_PACKAGES_remove = "connext-cmake-module"
+# rmw-implementation.inc removes "rmw-connext-cpp" from ROS_BUILD_DEPENDS.
+ROS_SUPERFLORE_GENERATED_WORLD_PACKAGES_remove = "rmw-connext-cpp"
+ROS_SUPERFLORE_GENERATED_WORLD_PACKAGES_remove = "rmw-connext-shared-cpp"
+# rosidl-typesupport-c.inc removes "rosidl-typesupport-connext-c" from ROS_BUILD_DEPENDS.
+ROS_SUPERFLORE_GENERATED_WORLD_PACKAGES_remove = "rosidl-typesupport-connext-c"
+# rosidl-typesupport-cpp.inc removes "rosidl-typesupport-connext-cpp" from ROS_BUILD_DEPENDS.
+ROS_SUPERFLORE_GENERATED_WORLD_PACKAGES_remove = "rosidl-typesupport-connext-cpp"