今天catkin build 整个工程，编译catkin_tools_prebuild时遇到失败的情况，如下：
The catkin CMake module was not found, but it is required to build a linked
workspace. To resolve this, please do one of the following, and try
building again.
1. Source the setup.sh file from an existing catkin workspace:
source SETUP_FILE
2. Extend another catkin workspace's result (install or devel) space:
catkin config --extend RESULT_SPACE
3. Set `catkin_DIR` to the directory containing `catkin-config.cmake`:
catkin config --cmake-args -Dcatkin_DIR=CATKIN_CMAKE_CONFIG_PATH
4. Add the catkin source package to your workspace's source space:
cd SOURCE_SPACE && git clone https://github.com/ros/catkin.git
根据提示的解决办法就是，加上下面的命令：
catkin config --extend /opt/ros/kinetic
原因分析：
出现上面的错误是由于你的编译环境没有找到ｒｏｓ,catkin config --extend 就是指定ros环境路径.。
我的ros环境就是/opt/ros/kinetic
