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+# ===========================================================================
+# http://autoconf-archive.cryp.to/ax_silent_mode.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_SILENT_MODE(on|off)
+#
+# DESCRIPTION
+#
+# Temporarily disable console output when running Autoconf macros. For
+# example:
+#
+# AX_SILENT_MODE(on) dnl disable console output
+# AC_PROG_CXX
+# AX_SILENT_MODE(off) dnl enable console output
+# AC_PROG_RANLIB
+#
+# LICENSE
+#
+# Copyright (c) 2008 Peter Simons <simons@cryp.to>
+# Copyright (c) 2008 Paolo Bonzini <bonzini@gnu.org>
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved.
+
+AC_DEFUN([AX_SILENT_MODE],
+ [
+ case "$1" in
+ on)
+ exec 6>/dev/null
+ ;;
+ off)
+ exec 6>&1
+ ;;
+ *)
+ AC_MSG_ERROR([Silent mode can only be switched "on" or "off".])
+ ;;
+ esac
+ ])dnl