Add comments to the code warning that _XOPEN_SOURCE might need to be
defined manually if using USE_PREAD or USE_PREAD64. (CVS 4509)
FossilOrigin-Name: d7ed7cd077fe5f9ffba2bca48b84b231ccfd85b0
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 85d9e1e..14e1083 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
-** @(#) $Id: sqliteInt.h,v 1.616 2007/10/23 15:51:27 drh Exp $
+** @(#) $Id: sqliteInt.h,v 1.617 2007/10/23 15:59:18 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_
@@ -112,6 +112,8 @@
** implemented on some systems. So we avoid defining it at all
** if it is already defined or if it is unneeded because we are
** not doing a threadsafe build. Ticket #2681.
+**
+** See also ticket #2741.
*/
#if !defined(_XOPEN_SOURCE) && !defined(__MACOS__) && SQLITE_THREADSAFE
# define _XOPEN_SOURCE 500 /* Needed to enable pthread recursive mutexes */