diff --git a/acconfig.h b/acconfig.h
index bf0e519a7eb3810efd0758af8b63be5b95c24f35..0f695bdaa13fe9ab83a8113e68edd8a9dc59407c 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -45,6 +45,9 @@
 /* Define to alignment constraint on unsigned int - whichever is the greater */
 #undef ALIGNMENT_UNSIGNED_INT
 
+/* Define if C Symbols have a leading underscore added by the compiler */
+#undef LEADING_UNDERSCORE
+
 
 /* Leave that blank line there!!  Autoheader needs it.
    If you're adding to this file, keep in mind:
diff --git a/mk/config.h.in b/mk/config.h.in
index 12544690905426a35bf3368e15773550ecae9308..e169f691e8537784cbf749b31e57a34128b679f1 100644
--- a/mk/config.h.in
+++ b/mk/config.h.in
@@ -215,3 +215,6 @@
 
 /* minimum alignment of double */
 #undef ALIGNMENT_DOUBLE
+
+/* need a leading underscore? */
+#undef LEADING_UNDERSCORE