--- a/src/configure.ac
+++ b/src/configure.ac
@@ -31,6 +31,14 @@
# OpenBSD needs sys/param.h for mount.h to compile
AC_CHECK_HEADERS([sys/param.h])
+
+# Check for where to find unordered_map etc.
+AC_LANG_PUSH([C++])
+AC_CHECK_HEADER(tr1/unordered_map,[AC_DEFINE([HAVE_TR1_UNORDERED],
+ [],["Have tr1"])],[])
+AC_CHECK_HEADER(unordered_map,[AC_DEFINE([HAVE_CXX0X_UNORDERED],
+ [],["Have C++0x"])],[])
+AC_LANG_POP([C++])
AC_CHECK_HEADERS([sys/mount.h sys/statfs.h sys/statvfs.h sys/vfs.h], [], [],
[#ifdef HAVE_SYS_PARAM_H