$NetBSD: patch-src_zm_logger_cpp,v 1.3 2013/04/29 21:31:13 joerg Exp $

If the system has syscall() but not SYS_gettid [E.g. NetBSD], don't attempt
to use SYS_gettid.

--- src/zm_logger.cpp.orig	2011-06-28 11:07:35.000000000 +0000
+++ src/zm_logger.cpp
@@ -33,6 +33,7 @@
 #include <signal.h>
 #include <stdarg.h>
 #include <errno.h>
+#include <unistd.h>
 
 bool Logger::smInitialised = false;
 Logger *Logger::smInstance = 0;
@@ -515,7 +516,7 @@ void Logger::logPrint( bool hex, const c
     #endif
 
         pid_t tid;
-#ifdef HAVE_SYSCALL
+#if defined(HAVE_SYSCALL) && defined(SYS_gettid)
         if ( (tid = syscall(SYS_gettid)) < 0 ) // Thread/Process id
 #endif // HAVE_SYSCALL
         tid = getpid(); // Process id