diff --git a/build_tools/list_valid_installed_externals b/build_tools/list_valid_installed_externals
index c37102208d8bbaceea798b0a1abf6de7568b88e3..862447a645c0da2e96642b91dd5710c9109292bd 100755
--- a/build_tools/list_valid_installed_externals
+++ b/build_tools/list_valid_installed_externals
@@ -19,10 +19,7 @@ EOF
 
 XMLSTARLET=`getvar XMLSTARLET`
 ASTMODDIR=`getvar ASTMODDIR`
-cache_dir=`getvar EXTERNALS_CACHE_DIR`
-DOWNLOAD_TO_STDOUT=`getvar DOWNLOAD_TO_STDOUT`
 HOST_CPU=`getvar HOST_CPU`
-INSTALL=`getvar INSTALL`
 
 tmpdir=$(mktemp -d)
 if [[ -z "${tmpdir}" ]] ; then