diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
@@ -49,6 +49,7 @@ PKG_CHECK_MODULES(DISTLIBS, libconfuse >
 PKG_CHECK_MODULES([CHECK], [check >= 0.9.3])
 
 AC_DEFINE_DIR([SYSCONFDIR], [sysconfdir], [Directory to find configuration files in])
+AC_DEFINE_DIR([LOCALSTATEDIR], [localstatedir], [Directory in which the server or client may store its state files and data])
 
 AC_CONFIG_FILES([Makefile
 src/Makefile