anchor.diff:    tar \
     vim \
     wget \
  -  xz-utils
  +  xz-utils && \
  +  apt-get -y clean
   
   # Build and install CMake from source.
   WORKDIR /usr/src
   RUN git clone git://cmake.org/cmake.git CMake && \
     cd CMake && \
  -  git checkout v3.4.3
  -RUN mkdir CMake-build
  -WORKDIR /usr/src/CMake-build
  -RUN /usr/src/CMake/bootstrap \
  +  git checkout v3.4.3 && \
  +  cd .. && mkdir CMake-build && \
  +  /usr/src/CMake/bootstrap \
       --parallel=$(nproc) \
       --prefix=/usr && \
     make -j$(nproc) && \
     ./bin/cmake -DCMAKE_USE_SYSTEM_CURL:BOOL=ON \
  +    -DCMAKE_BUILD_TYPE:STRING=Release \
       -DCMAKE_USE_OPENSSL:BOOL=ON . && \
     make install && \
  -  rm -rf *
  -WORKDIR /usr/src
  +  cd .. && \
  +  rm -rf CMake*
   
   # Build and install Ninja from source
   RUN git clone https://github.com/martine/ninja.git && \
  
positive.code:   bash \
    build-essential \
    bzip2 \
    curl \
    file \
    git \
  
negative.code:   git checkout v1.6.0 && \
    python ./configure.py --bootstrap && \
    ./ninja && \
    cp ./ninja /usr/bin/ && \
    cd .. && rm -rf ninja
  