anchor.diff:      "clisp --version | head -n 1" \
       "coffee -v | head -n 1" \
       "dmd --version | head -n 1" \
  +    "dmcs --version | head -n 1" \
  +    "gmcs --version | head -n 1" \
       "gcc --version | head -n 1" \
       "gdc --version | head -n 1" \
       "g++ --version | head -n 1" \
  
positive.code:     "lua -v | head -n 1" \
      "make -v | head -n 1" \
      "mvn -v | head -n 1" \
      "node -v | head -n 1" \
      "java -version | head -n 1" \
      "javac -version | head -n 1" \
  
negative.code:     lua5.3 \
      make \
      maven \
      mono-complete \
      mono-dmcs \
      mono-gmcs \
      nodejs \
      ocaml-nox \
      openjdk-8-jdk \
  