diff --git a/files/webos-crystal.mcf b/files/webos-crystal.mcf
index 804c059..259de2d 100644
--- a/files/webos-crystal.mcf
+++ b/files/webos-crystal.mcf
@@ -55,4 +55,7 @@ Layers = [
 
 # BblayersConfExtraLines is a list of strings to be appended to the generated
 # conf/bblayers.conf .
-BblayersConfExtraLines = []
+BblayersConfExtraLines = ['DISTRO ?= "' + Distribution + '"',
+                          'ROS_DISTRO ?= "crystal"',
+                          'ROS_SUPPORTED_MACHINES ?= "' + ' '.join(Machines) + '"',
+                         ]