运行pcl程序时，显示/usr/bin/ld: cannot find -lvtkproj4和No rule to make target '/usr/lib/x86_64-linux-gnu/libproj.so'

编译报错：

make[2]: *** No rule to make target '/usr/lib/x86_64-linux-gnu/libproj.so', needed by 'joinMap'.  Stop.

CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/joinMap.dir/all' failed
make[1]: *** [CMakeFiles/joinMap.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2
*** Failure: Exit code 2 ***

解决方法，执行：
sudo apt-get install libproj-dev

当使用pcl库时编译出现如下错误：

-- Build files have been written to: /home/wd/code/slambook-master/ch5/joinMap/build
[ 50%] Linking CXX executable joinMap
/usr/bin/ld: cannot find -lvtkproj4
collect2: error: ld returned 1 exit status
CMakeFiles/joinMap.dir/build.make:349: recipe for target 'joinMap' failed
make[2]: *** [joinMap] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/joinMap.dir/all' failed
make[1]: *** [CMakeFiles/joinMap.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2
*** Failure: Exit code 2 ***

由报错内容看，感觉像是缺少lvtkproj4，因为：cannot find -lvtkproj4 本来要安装一下看看，好在上方博客说的第二个问题就是此问题，大概原因是需要在cmakelist中加一条指令，对pcl进行修复。照做，更改cmakelist，在add_executable语句前面加上：

list(REMOVE_ITEM PCL_LIBRARIES “vtkproj4”)

语句内容上看是将PCL_LIBRARIES库列表中的”vtkproj4”移除掉。

来源：https://www.cnblogs.com/excellentlhw/p/11851037.html