configure.ac: add check for CXX

diff --git a/configure.ac b/configure.ac
index 05b6a3e..d02e82b 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -28,6 +28,7 @@ AM_PROG_CC_C_O dnl compiling with per-target flag
 if test "$ac_cv_prog_cc" = "no" ; then
    AC_MSG_ERROR([*** No C compiler found !])
 fi
+AC_PROG_CXX
 AC_PROG_INSTALL
 
 AUBIO_CFLAGS=