--- rpl/configure.ac	2017/05/29 09:51:09	1.186
+++ rpl/configure.ac	2017/06/17 10:53:41	1.187
@@ -211,7 +211,7 @@ AC_SUBST(INCRPLCAS)
 
 dnl Options
 AC_ARG_ENABLE(optimization,
-[  --enable-optimization   set compiler flags [[default=environment variables -O3]]], [
+[  --enable-optimization   set compiler flags [[default=environment variables -O2, enable=environment variables -O3]]], [
 if test "$enableval" = "no"; then
 	CFLAGS=$ABI
 	FFLAGS=$ABI
@@ -223,10 +223,10 @@ else
 	CXXFLAGS="$CXXFLAGS $ABI $OPTIMISATION_CXX"
 	FCFLAGS="$FCFLAGS $ABI $OPTIMISATION_F"
 fi],[
-	CFLAGS="$CFLAGS $ABI $OPTIMISATION_C" 
-	FFLAGS="$FFLAGS $ABI $OPTIMISATION_F"
-	CXXFLAGS="$CXXFLAGS $ABI $OPTIMISATION_CXX"
-	FCFLAGS="$FCFLAGS $ABI $OPTIMISATION_F"
+	CFLAGS="$CFLAGS $ABI -O2" 
+	FFLAGS="$FFLAGS $ABI -O2"
+	CXXFLAGS="$CXXFLAGS $ABI -O2"
+	FCFLAGS="$FCFLAGS $ABI -O2"
 	]
 )