Description: <short summary of the patch>
 TODO: Put a short summary on the line above and replace this paragraph
 with a longer explanation of this change. Complete the meta-information
 with other relevant fields (see below for details). To make it easier, the
 information below has been extracted from the changelog. Adjust it or drop
 it.
 .
 gcl (2.6.7+dfsga-12) unstable; urgency=low
 .
   * ia64/hurd/s390
Author: Camm Maguire <camm@debian.org>

---
The information above should follow the Patch Tagging Guidelines, please
checkout http://dep.debian.net/deps/dep3/ to learn about the format. Here
are templates for supplementary fields that you might want to add:

Origin: <vendor|upstream|other>, <url of original patch>
Bug: <url in upstream bugtracker>
Bug-Debian: http://bugs.debian.org/<bugnumber>
Bug-Ubuntu: https://launchpad.net/bugs/<bugnumber>
Forwarded: <no|not-needed|url proving that it has been forwarded>
Reviewed-By: <name and email of someone who approved the patch>
Last-Update: <YYYY-MM-DD>

--- gcl-2.6.7+dfsga.orig/o/main.c
+++ gcl-2.6.7+dfsga/o/main.c
@@ -508,8 +508,8 @@ initlisp(void) {
              || NULL_OR_ON_C_STACK(IM_FIX_BASE) == 0
              || NULL_OR_ON_C_STACK((IM_FIX_BASE|IM_FIX_LIM)) == 0
 #endif
-	    || NULL_OR_ON_C_STACK(vv) != 0
-	    || NULL_OR_ON_C_STACK(data_start)
+	    || NULL_OR_ON_C_STACK(vv)
+	    || NULL_OR_ON_C_STACK(pagetoinfo(first_data_page))
 	    || NULL_OR_ON_C_STACK(core_end-1))
 	  /* check person has correct definition of above */
 	  error("NULL_OR_ON_C_STACK macro invalid");
