diff -upr liblangtag-0.5.8/configure.ac liblangtag-0.5.7/configure.ac
--- configure.ac.orig	2015-11-10 09:40:44.000000000 +0100
+++ configure.ac	2015-06-26 10:52:29.000000000 +0200
@@ -18,7 +18,7 @@ AM_MAINTAINER_MODE
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([m4macros])
 
-AX_CHECK_ENABLE_DEBUG([no], [ENABLE_DEBUG])
+AX_CHECK_ENABLE_DEBUG
 
 AC_USE_SYSTEM_EXTENSIONS
 AC_PROG_CC
