diff --git a/acconfig.h b/acconfig.h
index 8e358385ec134eb9f33392ceecdd1331d2cf33bc..fb03bfafce7840c531b267d079c887d29869e95d 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -27,8 +27,11 @@
 /* Define to alignment constraint on unsigned int - whichever is the greater */
 #undef ALIGNMENT_UNSIGNED_INT
 
-/* Define if we're have GNU libc. */
-#undef _GNU_SOURCE
+/* Define if code lives before data in memory */
+#undef CODE_BEFORE_DATA
+
+/* Define as the symbol which marks the end of the data section */
+#undef DATA_SECTION_END_MARKER
 
 /* Define if time.h or sys/time.h define the altzone variable */
 #undef HAVE_ALTZONE
@@ -42,6 +45,9 @@
 /* Define if C Symbols have a leading underscore added by the compiler */
 #undef LEADING_UNDERSCORE
 
+/* Define as the symbol which marks the end of the text section */
+#undef TEXT_SECTION_END_MARKER
+
 /* Define to the type of the timezone variable (usually long or time_t) */
 #undef TYPE_TIMEZONE