Fix glitches with 'configure --without-sync-input'.

* configure.ac (--without-sync-input): Fix typo in usage message.
* alloc.c [!SYSTEM_MALLOC && !SYNC_INPUT && HAVE_PTHREAD]:
Include "syssignal.h", for 'main_thread'.

2 files changed, 7 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 27698886079..b1b4dc8bbcd 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2012-09-14  Paul Eggert  <eggert@cs.ucla.edu>
+
+        * alloc.c [!SYSTEM_MALLOC && !SYNC_INPUT && HAVE_PTHREAD]:
+        Include "syssignal.h", for 'main_thread'.
+
 2012-09-14  Dmitry Antipov  <dmantipov@yandex.ru>
 
         Avoid out-of-range marker position (Bug#12426).
diff --git a/src/alloc.c b/src/alloc.c
index 77807f6e086..25cf03dfa2e 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -100,6 +100,8 @@ extern void _free_internal (void *);
 #if ! defined SYSTEM_MALLOC && ! defined SYNC_INPUT
 #ifdef HAVE_PTHREAD
 
+# include "syssignal.h"
+
 /* When GTK uses the file chooser dialog, different backends can be loaded
    dynamically.  One such a backend is the Gnome VFS backend that gets loaded
    if you run Gnome.  That backend creates several threads and also allocates