1 files changed, 4 insertions, 3 deletions

diff --git a/src/mem-limits.h b/src/mem-limits.h
index e814de10f0d..c63e0b48399 100644
--- a/src/mem-limits.h
+++ b/src/mem-limits.h
@@ -29,8 +29,9 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #include <sys/resource.h>
 #define BSD4_2                  /* Tell code below to use getrlimit.  */
 
-extern int __data_start;
-#define start_of_data() &__data_start
+/* Old Linux startup code won't define __data_start.  */
+extern int __data_start; weak_symbol (__data_start)
+#define start_of_data() (&__data_start ?: &etext)
 
 #else /* not _LIBC */
 
@@ -88,7 +89,7 @@ extern char etext;
 #endif
 #endif
 
-#else  /* not emacs */ 
+#else  /* not emacs */
 extern char etext;
 #define start_of_data() &etext
 #endif /* not emacs */