Index: configure
===================================================================
--- configure	(revision f9723e8ec57193bf0ba2c9236fc95d6b60e6dcb0)
+++ configure	(revision 331eacbee5ac9c46c456276faffaa966044ee275)
@@ -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 f9723e8ec57193bf0ba2c9236fc95d6b60e6dcb0)
+++ configure.ac	(revision 331eacbee5ac9c46c456276faffaa966044ee275)
@@ -14,4 +14,5 @@
 # don't use the default CFLAGS as they unconditonnaly add -O2
 : ${CFLAGS=""}
+: ${CXXFLAGS=""}
 
 AM_INIT_AUTOMAKE([subdir-objects])