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{ bionix , nixpkgs , flags ? null }: input: with nixpkgs; with lib; stdenv.mkDerivation { name = "samtools-faidx"; buildInputs = [ samtools ]; buildCommand = '' ln -s ${input} input.fasta samtools faidx ${optionalString (flags != null) flags} input.fasta cp input.fasta.fai $out ''; }