+AC_CACHE_CHECK([whether the C++ compiler works], [avahi_cv_sys_cxx_works], [
+ AC_LANG_PUSH([C++])
+ AC_COMPILE_IFELSE([int main() { return 0; }], [avahi_cv_sys_cxx_works=yes],
+ [avahi_cv_sys_cxx_works=no])
+ AC_LANG_POP([C++])
+ ])
+[ if [ "x$avahi_cv_sys_cxx_works" = "xno" ]; then ]
+ AC_MSG_FAILURE([The C++ compiler does not work])
+[ fi ]
+