Admin/java/build

--- a/Admin/java/build	Thu Sep 26 10:42:10 2013 +0200
+++ b/Admin/java/build	Thu Sep 26 12:56:59 2013 +0200
@@ -71,7 +71,10 @@
 
 # content
 
-export COPYFILE_DISABLE=true
+#GNU tar (notably on Mac OS X)
+if [ -x /usr/bin/gnutar ]; then
+  function tar() { /usr/bin/gnutar "$@"; }
+fi
 
 mkdir "$DIR/x86-linux" "$DIR/x86_64-linux" "$DIR/x86_64-darwin" "$DIR/x86-cygwin"