Replace deprecated macro

diff --git a/configure.ac b/configure.ac
index 72527c6c08902b492ead536f8d3202a0fa651d0e..219018820e2bf4d8720d640de4c99d4c8f89c6dd 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -22,7 +22,7 @@ AM_PROG_LEX
 AC_PROG_INSTALL
 AC_PROG_MAKE_SET
 AC_PROG_LIBTOOL
-AC_LANG_CPLUSPLUS
+AC_LANG([C++])
 
 AC_CHECK_PROG([RAGEL], [ragel], [ragel])
 AC_CHECK_PROG([ASCIIDOC], [asciidoc], [asciidoc])