diff --git a/build.sh b/build.sh
index 900523f275d1f00ba3481077ddc33d33d2faa35b..3ce7fe8c13ccb709c3541fdf6291748c6ec5b2e3 100755
--- a/build.sh
+++ b/build.sh
@@ -155,6 +155,7 @@ check_prerequisites()
     for tool in $TOOLS; do
         if ! ( type $tool >/dev/null 2>&1 ); then
             echo "Missing \"$tool\" which is a required tool!" | tee -a $LOGFILE
+            echo "Required are: $TOOLS" | tee -a $LOGFILE
             return 1
         fi
     done