since we refer to C++ later in configure, we need to search for the prog
http://bugs.gentoo.org/212772
--- configure.in+++ configure.in@@ -30,6 +30,7 @@AC_ISC_POSIX
AC_PROG_CC
AM_PROG_CC_C_O
+AC_PROG_CXXAC_HEADER_STDC
AC_PROG_LIBTOOL
AC_PROG_MAKE_SET