Making the current versions of flex/bison the default. Evaluation test passes. Please explicitly pass older versions to any package that can be adversely affected by too-fresh versions.
Making the current versions of flex/bison the default. Evaluation test passes. Please explicitly pass older versions to any package that can be adversely affected by too-fresh versions.

svn path=/nixpkgs/branches/stdenv-updates/; revision=25086

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