diff --git a/include/llvm/Config/config.h.in b/include/llvm/Config/config.h.in
index 70f4d5852ab..6265a36632d 100644
--- a/include/llvm/Config/config.h.in
+++ b/include/llvm/Config/config.h.in
@@ -24,6 +24,9 @@
 /* Define if bzip2 library is available on this platform. */
 #undef HAVE_BZIP2
 
+/* Define to 1 if you have the <bzlib.h> header file. */
+#undef HAVE_BZLIB_H
+
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #undef HAVE_DLFCN_H
 
@@ -203,6 +206,9 @@
 /* Define if zlib library is available on this platform. */
 #undef HAVE_ZLIB
 
+/* Define to 1 if you have the <zlib.h> header file. */
+#undef HAVE_ZLIB_H
+
 /* Installation directory for binary executables */
 #undef LLVM_BINDIR