+find output -name 'building-contrib.*' -print | xargs rm -f
+
+# Ignore all source registries.
+CL_SOURCE_REGISTRY='(:source-registry :ignore-inherited-configuration)'
+export CL_SOURCE_REGISTRY
+
+if [ -z "$*" ]; then
+ contribs_to_build=contrib/*
+else
+ for name in $*; do
+ contribs_to_build="contrib/$name $contribs_to_build"
+ done
+fi
+
+for i in $contribs_to_build; do