--- configure.ac.orig	2011-03-20 21:26:41.000000000 +0000
+++ configure.ac	2011-03-20 21:26:57.000000000 +0000
@@ -85,7 +85,7 @@
 have_cpp=no
 if test "$with_cpp" = "yes";  then
   AX_BOOST_BASE([1.33.1])
-  if test "x$succeeded" == "xyes" ; then
+  if test "x$succeeded" = "xyes" ; then
     have_cpp="yes"
   fi