diff --git a/qse/configure b/qse/configure
index bbb5c074..ad7b0d4c 100755
--- a/qse/configure
+++ b/qse/configure
@@ -1599,7 +1599,7 @@ Optional Features:
   --enable-wchar          use wchar_t a default charater type when enabled
                           (default. yes)
   --enable-syscall        use the syscall() function to call system calls
-                          (default. yes)
+                          (default. no)
   --enable-debug          build the library in the debug mode (default. no)
   --enable-objc           build the library for Objective-C if an Objective-C
                           compiler is available (default. yes)
@@ -25544,7 +25544,7 @@ fi
 if test "${enable_syscall+set}" = set; then
   enableval=$enable_syscall; enable_syscall_is=$enableval
 else
-  enable_syscall_is=yes
+  enable_syscall_is=no
 fi
 
 if test "${enable_syscall_is}" = "yes"
diff --git a/qse/configure.ac b/qse/configure.ac
index ed27b098..09bee87c 100644
--- a/qse/configure.ac
+++ b/qse/configure.ac
@@ -185,8 +185,8 @@ else
 fi
 
 AC_ARG_ENABLE([syscall], [AC_HELP_STRING([--enable-syscall],
-	[use the syscall() function to call system calls (default. yes)])],
-	enable_syscall_is=$enableval,enable_syscall_is=yes)
+	[use the syscall() function to call system calls (default. no)])],
+	enable_syscall_is=$enableval,enable_syscall_is=no)
 if test "${enable_syscall_is}" = "yes"
 then
 	AC_DEFINE([QSE_USE_SYSCALL],[],[use the syscall() function to invoke a system call])
diff --git a/qse/lib/awk/fnc.c b/qse/lib/awk/fnc.c
index e6497916..bfbc485f 100644
--- a/qse/lib/awk/fnc.c
+++ b/qse/lib/awk/fnc.c
@@ -1,5 +1,5 @@
 /*
- * $Id: fnc.c 271 2009-08-27 12:52:20Z hyunghwan.chung $
+ * $Id: fnc.c 274 2009-08-28 12:47:09Z hyunghwan.chung $
  *
    Copyright 2006-2009 Chung, Hyung-Hwan.
 
@@ -240,7 +240,7 @@ static int fnc_close (qse_awk_rtx_t* rtx, const qse_cstr_t* fnm)
 	QSE_ASSERT (nargs == 1 || nargs == 2);
 
 	a0 = qse_awk_rtx_getarg (rtx, 0);
-	a1 = qse_awk_rtx_getarg (rtx, 1);
+	if (nargs >= 2) a1 = qse_awk_rtx_getarg (rtx, 1);
 	QSE_ASSERT (a0 != QSE_NULL);
 
 	if (a0->type == QSE_AWK_VAL_STR)