catkin_make错误解决方法

1. 错误代码：
   The specified base path “/home/ghy/catkin_qt” contains a CMakeLists.txt but “catkin_make” must be invoked in the root of workspace…..

出现这种情况的原因是在catkin_qt目录下运行下catkin_init_workspacce初始化工作空间，出现下面这句：
Creating symlink “/home/ghy/catkin_qt/CMakeLists.txt” pointing to “/opt/ros/indigo/share/catkin/cmake/toplevel.cmake”

将当前工作空间下的CMakeLists.txt与/ros/下的cmake做了链接

解决方法：

unlink /home/ghy/catkin_qt/CMakeLists.tx

原文链接：https://blog.csdn.net/u013294888/article/details/69696956

2. catkin_make 尚未安装，错误代码：
   
   但安装时显示已安装
   
   出现这种情况的原因是环境变量没有配置好。
   解决办法：

echo "source /opt/ros/melodic/setup.bash" >> ~/.bashrc
source ~/.bashrc
catkin_init_workspace