diff -urN ../exim-4.90.orig/src/drtables.c ./src/drtables.c
--- ../exim-4.90.orig/src/drtables.c	2017-12-13 00:14:38.000000000 +0200
+++ ./src/drtables.c	2018-01-14 13:47:05.241327000 +0200
@@ -119,7 +119,7 @@
   {
   .driver_name =	US"heimdal_gssapi",
   .options =		auth_heimdal_gssapi_options,
-  .options_count 	 &auth_heimdal_gssapi_options_count,
+  .options_count =	&auth_heimdal_gssapi_options_count,
   .options_block =	&auth_heimdal_gssapi_option_defaults,
   .options_len =	sizeof(auth_heimdal_gssapi_options_block),
   .init =		auth_heimdal_gssapi_init,