问题是：
如何让RRDTool在Mac OS X上生成图表？
我在Mac OS x 10.6.8上使用rrdtool安装了homebrew。
我能够创建数据库，更新一些数据并获取数据，但我无法为其生成图表。
glib和pango似乎有问题。
这两个库都安装了homebrew。
我正在使用：
当我运行时：
rrdtool create datafile.rrd DS:packets:ABSOLUTE:900:0:10000000 RRA:AVERAGE:0.5:1:9600 RRA:AVERAGE:0.5:4:9600 RRA:AVERAGE:0.5:24:6000
rrdtool update datafile.rrd N:12322
rrdtool graph graph.png DEF:pkt=datafile.rrd:packets:AVERAGE LINE1:pkt#ff0000:Packets
我明白了：
(process:34285): GLib-GObject-CRITICAL **: g_object_ref: assertion `G_IS_OBJECT (object)' failed
(process:34285): GLib-GObject-CRITICAL **: g_object_get_qdata: assertion `G_IS_OBJECT (object)' failed
(process:34285): GLib-GObject-CRITICAL **: g_object_set_qdata_full: assertion `G_IS_OBJECT (object)' failed
(process:34285): Pango-CRITICAL **: pango_fontset_foreach: assertion `PANGO_IS_FONTSET (fontset)' failed
(process:34285): Pango-CRITICAL **: pango_fontset_foreach: assertion `PANGO_IS_FONTSET (fontset)' failed
(process:34285): Pango-WARNING **: failed to choose a font, expect ugly output. engine-type='PangoRenderCoreText', script='latin'
(process:34285): GLib-GObject-CRITICAL **: g_object_ref: assertion `G_IS_OBJECT (object)' failed
(process:34285): Pango-WARNING **: couldn't load font "DejaVu Sans Mono,Bitstream Vera Sans Mono,monospace,Courier Not-Rotated 8", modified variant/weight/stretch as fallback, expect ugly output.
(process:34285): GLib-GObject-CRITICAL **: g_object_ref: assertion `G_IS_OBJECT (object)' failed
(process:34285): Pango-ERROR **: Could not load fallback font, bailing out.
./test.sh: line 9: 34285 Trace/BPT trap rrdtool graph graph.png DEF:pkt=datafile.rrd:packets:AVERAGE LINE1:pkt#ff0000:Packets
由于