[gentoo-dev] reminder: you cannot use bash-4.x features (e.g. ${var^^}) in EAPI=[0-5]

[Mike Frysinger]

i randomly stumbled across an ebuild that was using ^^ to make a variable
uppercase.  this is new to bash-4.0 and thus invalid for EAPI=[0-5].  only
the fresh EAPI=6 permits it since we bumped the min ver to bash-4.2.
-mike

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