anchor.diff:      install -Dm555 -t $out/bin ninja
       install -Dm444 misc/bash-completion $out/share/bash-completion/completions/ninja
       install -Dm444 misc/zsh-completion $out/share/zsh/site-functions/_ninja
  -  '' + optionalString buildDocs ''
  +  '' + lib.optionalString buildDocs ''
       install -Dm444 -t $out/share/doc/ninja doc/manual.asciidoc doc/manual.html
     '';
   
     setupHook = ./setup-hook.sh;
   
  -  meta = {
  +  meta = with lib; {
       description = "Small build system with a focus on speed";
       longDescription = ''
         Ninja is a small build system with a focus on speed. It differs from
  
positive.code:     platforms = platforms.unix;
      maintainers = with maintainers; [ thoughtpolice bjornfor orivej ];
    };
  }
  
negative.code: { lib
  , stdenv
  , fetchFromGitHub
  , fetchpatch
  , asciidoc
  , docbook_xml_dtd_45
  , docbook_xsl
  , libxslt
  , python3
  , re2c
  , buildDocs ? true
  }:
  
  stdenv.mkDerivation (finalAttrs: {
    pname = "ninja";
    version = "1.11.1";
  
    src = fetchFromGitHub {
      owner = "ninja-build";
      repo = "ninja";
      rev = "v${finalAttrs.version}";
      hash = "sha256-LvV/Fi2ARXBkfyA1paCRmLUwCh/rTyz+tGMg2/qEepI=";
    };
  
    nativeBuildInputs = [
      python3
      re2c
    ]
    ++ lib.optionals buildDocs [
      asciidoc
      docbook_xml_dtd_45
      docbook_xsl
      libxslt.bin
    ];
  
    buildPhase = ''
      python configure.py --bootstrap
    '' + lib.optionalString buildDocs ''
      # "./ninja -vn manual" output copied here to support cross compilation.
      asciidoc -b docbook -d book -o build/manual.xml doc/manual.asciidoc
      xsltproc --nonet doc/docbook.xsl build/manual.xml > doc/manual.html
  