POSIX sh (and `bash`) impose a restriction on environment variable name format and disallow hypheps in the names. Normally it's not a problem as nothing usually tries to refer nyphenated names. One exception is `nix develop` (https://github.com/NixOS/nix/issues/6848): $ nix develop -f. gcc -L gcc-wrapper> ...-get-env.sh: line 70: expand-response-params: bad substitution Note that bash usually uses explicitly created `expandResponseParams` variant of the same variable. To work the problem around let's avoid environment variable export and move it to `passthru` for `cc` (used ina few places) and remove it completely for `binutils` (does not seem to be used at all).main
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