reduce packaging size

yarn/yarn.spec

@@ -36,14 +36,14 @@ Class:        EVAL
 Group:        Archiver
 License:      MIT
 Version:      %{V_yarn}
-Release:      20170107
+Release:      20170114
 
 #   list of sources
 Source0:      http://download.openpkg.org/components/versioned/yarn/yarn-%{V_yarn}-%{V_yarn_snap}.tar.gz
 Source1:      yarn.sh
 
 #   build information
-BuildPreReq:  OpenPKG, openpkg >= 20160101
+BuildPreReq:  OpenPKG, openpkg >= 20160101, modclean
 PreReq:       OpenPKG, openpkg >= 20160101, node
 
 %description
@@ -64,6 +64,7 @@ PreReq:       OpenPKG, openpkg >= 20160101, node
     %setup -q -c
 
 %build
+    modclean -p . -n default:safe,default:caution -r -P
 
 %install
     %{l_shtool} mkdir -f -p -m 755 \