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I had these problems on -CURRENT. portsnap showed me the error message
	
	
	
		
And found the solution:
http://groups.google.com/group/mailing.freebsd.current/browse_thread/thread/826353688276b446?pli=1
After patching bsdtar (csup, make all install in bsdtar directory), the problem disappeared.
				
			I had these problems on -CURRENT. portsnap showed me the error message
		Code:
	
	Error opening archive: Invalid GZip header
	And found the solution:
http://groups.google.com/group/mailing.freebsd.current/browse_thread/thread/826353688276b446?pli=1
After patching bsdtar (csup, make all install in bsdtar directory), the problem disappeared.