Index: configure
--- configure.orig	2019-02-02 10:19:54.528732000 +0100
+++ configure	2019-02-02 10:21:26.056722000 +0100
@@ -12669,7 +12669,6 @@
 
 
 LDFLAGS="$LIBS $LIBM $LDFLAGS"
-CFLAGS="-Wall $CFLAGS"
 
 ac_ext=cpp
 ac_cpp='$CXXCPP $CPPFLAGS'
@@ -16371,7 +16370,7 @@
 ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
-CXXFLAGS="-Wall -Wno-unused-function -DNDEBUG -O3 -fomit-frame-pointer $CXXFLAGS"
+CXXFLAGS="-Wno-unused-function -DNDEBUG -O2 -fomit-frame-pointer $CXXFLAGS"
 # Check whether --enable-cxxmph was given.
 if test "${enable_cxxmph+set}" = set; then :
   enableval=$enable_cxxmph; case "${enableval}" in
