Try commenting out block

.travis.yml

@@ -132,17 +132,16 @@ before_install:
       brew install -y https://raw.githubusercontent.com/Homebrew/homebrew-core/5b680fb58fedfb00cd07a7f69f5a621bb9240f3b/Formula/doxygen.rb;
       sudo pip install -U pytest --ignore-installed six;
     fi
-  - if [[ "${TRAVIS_CPU_ARCH}" == "ppc64le" || "${TRAVIS_CPU_ARCH}" == "arm64" ]]; then
-      # The cmake version installed by apt on these architectures is very old,
-      # so build a more recent version from source.
-      
-      wget https://github.com/Kitware/CMake/releases/download/v3.17.1/cmake-3.17.1.tar.gz;
-      tar xf cmake-3.17.1.tar.gz;
-      cd cmake-3.17.1;
-      ./bootstrap;
-      make;
-      sudo make install;
-    fi
+  #- if [[ "${TRAVIS_CPU_ARCH}" == "ppc64le" || "${TRAVIS_CPU_ARCH}" == "arm64" ]]; then
+  #    # The cmake version installed by apt on these architectures is very old,
+  #    # so build a more recent version from source.
+  #    wget https://github.com/Kitware/CMake/releases/download/v3.17.1/cmake-3.17.1.tar.gz;
+  #    tar xf cmake-3.17.1.tar.gz;
+  #    cd cmake-3.17.1;
+  #    ./bootstrap;
+  #    make;
+  #    sudo make install;
+  #  fi
   #- if [[ "${TRAVIS_OS_NAME}" == "linux" ]]; then
   #    CMAKE_URL="http://cmake.org/files/v3.7/cmake-3.7.2-Linux-x86_64.tar.gz";
   #    mkdir $HOME/cmake && travis_retry wget --no-check-certificate --quiet -O - ${CMAKE_URL} | tar --strip-components=1 -xz -C $HOME/cmake;