[MacPorts] #15906: "port -d upgrade apr" fails with internal error

[MacPorts]

#15906: "port -d upgrade apr" fails with internal error
--------------------------------+-------------------------------------------
 Reporter:  stephen at xemacs.org  |       Owner:  macports-tickets at lists.macosforge.org
     Type:  defect              |      Status:  new                                  
 Priority:  Normal              |   Milestone:  MacPorts base bugs                   
Component:  base                |     Version:  1.7.0                                
 Keywords:                      |  
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 port version 1.700 (trunk)[[BR]]
 svn revision 38128

 {{{
 Error: Target org.macports.fetch returned: couldn't fork child process:
 resource temporarily unavailable
 Warning: the following items did not execute (for apr):
 org.macports.archive org.macports.fetch org.macports.extract
 org.macports.checksum org.macports.patch org.macports.configure
 org.macports.build org.macports.destroot
 DEBUG: invalid command name "ui_prefix"
     while executing
 "ui_prefix $priority"
     invoked from within
 "set prefix [ui_prefix $priority]"
     ("uplevel" body line 2)
     invoked from within
 "uplevel 1 $body"
 Error: Unable to upgrade port: 1
 chibi:MacPorts steve$
 }}}

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Ticket URL: <http://trac.macports.org/ticket/15906>
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