Index: configure
===================================================================
--- configure	(revision 158b026fb8f759ed1b6cebe96e8a07ccb25235cb)
+++ configure	(revision 856fe3e61a2862cb2fb75b99c62e6a042adeb092)
@@ -2557,4 +2557,5 @@
 # don't use the default CFLAGS as they unconditonnaly add -O2
 : ${CFLAGS=""}
+: ${CXXFLAGS=""}
 
 am__api_version='1.15'