title: catkin build fails to compile
body: <p>I am trying to compile a build file for a sample tutorial in ROS packages. The following shows up in the Terminal,</p>
  
  <pre><code>Errors     &lt;&lt; catkin_tools_prebuild:cmake /home/comet/mybot_ws/logs/catkin_tools_prebuild/build.cmake.009.log
  CMake Error at /opt/ros/kinetic/share/catkin/cmake/safe_execute_process.cmake:11 (message):
    execute_process(/home/comet/anaconda3/bin/python
    "/opt/ros/kinetic/share/catkin/cmake/parse_package_xml.py"
    "/opt/ros/kinetic/share/catkin/cmake/../package.xml"
    "/home/comet/mybot_ws/build/catkin_tools_prebuild/catkin/catkin_generated/version/package.cmake")
    returned error code No such file or directory
  Call Stack (most recent call first):
    /opt/ros/kinetic/share/catkin/cmake/catkin_package_xml.cmake:74 (safe_execute_process)
    /opt/ros/kinetic/share/catkin/cmake/all.cmake:151 (_catkin_package_xml)
    /opt/ros/kinetic/share/catkin/cmake/catkinConfig.cmake:20 (include)
    CMakeLists.txt:4 (find_package)
  </code></pre>
  
  <p>It appears that it is trying to access the python compiler in an anaconda3 folder but I have it uninstalled recently. Any ideas how I could modify the files so that it points to  /usr/bin python ? Any ideas are appreciated. Thank you very much!</p>