diff --git a/configure.in b/configure.in
index 503c09d..d25a64b 100644
--- a/configure.in
+++ b/configure.in
@@ -29,6 +29,7 @@ AC_SUBST(LT_AGE)
 
 AC_ISC_POSIX
 AC_PROG_CC
+AC_PROG_CXX
 AM_PROG_CC_C_O
 AC_HEADER_STDC
 AC_PROG_LIBTOOL