+%{!?iwlwifi:%global iwlwifi 0}
+
+# default is to search the config file after pldistro
+# e.g. set
+# kernel-SPECVARS := kernelconfig=planetlab
+# to use the planetlab config from another pldistro
+# without having to manage symlinks
+%{!?kernelconfig:%global kernelconfig %{pldistro}}