diff --git a/include/dix-config.h.in b/include/dix-config.h.in
index 26f4b6a64..6c3d91c59 100644
--- a/include/dix-config.h.in
+++ b/include/dix-config.h.in
@@ -75,6 +75,9 @@
 /* Define to 1 if you have the <asm/mtrr.h> header file. */
 #undef HAVE_ASM_MTRR_H
 
+/* Has backtrace support */
+#undef HAVE_BACKTRACE
+
 /* Define to 1 if you have the <byteswap.h> header file. */
 #undef HAVE_BYTESWAP_H
 
@@ -94,6 +97,9 @@
 /* Define to 1 if you don't have `vprintf' but do have `_doprnt.' */
 #undef HAVE_DOPRNT
 
+/* Have execinfo.h */
+#undef HAVE_EXECINFO_H
+
 /* Define to 1 if you have the <fcntl.h> header file. */
 #undef HAVE_FCNTL_H