Fix zstd not enable
diff --git a/cmake-config.h.in b/cmake-config.h.in
index 9170dff..a30b8e0 100644
--- a/cmake-config.h.in
+++ b/cmake-config.h.in
@@ -29,6 +29,7 @@
 #cmakedefine HAVE_GNUTLS
 #cmakedefine HAVE_LIBBZ2
 #cmakedefine HAVE_LIBLZMA
+#cmakedefine HAVE_LIBZSTD
 #cmakedefine HAVE_LOCALTIME_R
 #cmakedefine HAVE_MBEDTLS
 #cmakedefine HAVE_MKSTEMP