[BioC] Trouble Loading RBGL

[Jeff Gentry]

> * Installing *source* package 'RBGL' ...
> untarring boost include tree...
> tar: z: unknown option
> Usage: tar {txruc@}[vfbFXhiBEelmopwnq[0-7]] [-k size] [tapefile]
> [blocksize] [exclude-file] [-I include-file] files ...
> error: configuration failed for package 'RBGL': No such file or
> directory for reading errors.
> ** Removing '/home/msib/landej/Rlib/RBGL'

It looks like the configure script of RBGL is using 'tar xvzf' to
uncompress the boost library code, but your tar doesn't support the 'z'
option (which is uncommon these days, but apparently not unheard of).