Add C++ API

Change-Id: Iff634f22d43470e2dc028387b3816257fd7b4156
Signed-off-by: Klement Sekera <ksekera@cisco.com>
diff --git a/src/configure.ac b/src/configure.ac
index 2efb23a..f5ce3be 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -7,6 +7,7 @@
 AC_CONFIG_MACRO_DIR([m4])
 
 AC_PROG_CC
+AC_PROG_CXX
 AM_PROG_AS
 AM_PROG_LIBTOOL
 AC_PROG_YACC