Index: configure
===================================================================
--- configure	(revision 3d3cbd09b970cf7985bfab5afe5453d45e24f422)
+++ configure	(revision 87f572e03e0f6838145653627b5a047aa352e14a)
@@ -2557,4 +2557,5 @@
 # don't use the default CFLAGS as they unconditonnaly add -O2
 : ${CFLAGS=""}
+: ${CXXFLAGS=""}
 
 am__api_version='1.15'
Index: configure.ac
===================================================================
--- configure.ac	(revision 3d3cbd09b970cf7985bfab5afe5453d45e24f422)
+++ configure.ac	(revision 87f572e03e0f6838145653627b5a047aa352e14a)
@@ -14,4 +14,5 @@
 # don't use the default CFLAGS as they unconditonnaly add -O2
 : ${CFLAGS=""}
+: ${CXXFLAGS=""}
 
 AM_INIT_AUTOMAKE([subdir-objects])