diff --git a/build/configure.sh b/build/configure.sh
index 6e9ff35246a3eb847a9c7d1fd926a4315bae61f1..96ef0a80856069f10b3128b4f768baab60fd2fcb 100755
--- a/build/configure.sh
+++ b/build/configure.sh
@@ -912,6 +912,7 @@ fi
 
 # Print a summary of configuration options
 echo "INFO: optimization level is ${CXX_OPT}."
+echo "INFO: optimization level is ${CXX_OPT}." >> configure.log
 if [ "x${CXX_DBG}" = "x" ]; then
     echo "INFO: gdb is disabled."
     echo "INFO: gdb is disabled." >> configure.log