在Pod里，有个第三方库不更新了，但是里面的警告挺多的，开发组老大让我把它单独挪出来，把警告处理掉，期间遇到了一个坑，于是就有了这篇文章。
如约，Pods工程目录下，把Posfile里的那个库注释掉，然后：
pod install
回车，
Analyzing dependencies
Removing XXX
...
然后把XXX拖进项目另一个工程目录下，commond+ B，出现error：
"xxx.h" file no find
出现这个这个正常，因为有缓存，于是shift + cmmond + k，清除缓存，再commod + B，重新编译。
这个时候，本文重点描述的幺蛾子error出现了：
ld: library not found for -lXXXXX(XXXX就是对应的库名称)
clang: error: linker command failed with exit code 1 (use -v to see invocation)
解决方法：
查找网络资源：
第二篇里面提到Link binary With Libraries和Library Search Path，但是都没有解决目前这个问题。但是已经很接近error的真相了：依赖路径不对。
这里的处理方式是：
在主项目中打开Build Settings -> Other Link Flags 打开以后，发现里面存在对应的库名称，前面还有一个前缀修饰： -lxxx。把它干掉。
commod + R
屏幕显示:
Never say never
摘录如下：
Q: here are three different search paths in XCode Build Settings:
- Framework Search Path
- Header Search Path
- Library Search Path
Could anyone clarify what those paths do and what they are used for?
In Mac development, it's set automatically if you drag a 3rd party framework into the project. Otherwise, just set it to the container directory where you saved the framework.
In xcconfig files you use this variable:
FRAMEWORK_SEARCH_PATHS = "/path/to/frameworks/container/directory"
Header search path: where to search for header files (.h files) in addition to system paths. Usually you'll need it if you are using a 3rd party library. Set it to the directory where you have the header files. If you use a directory to include the header (example: #import "mylibrary/component.h") set it to the parent directory.
In xcconfig files you use this variable:
HEADER_SEARCH_PATHS = "/path/to/headers/container/directory"
Library search path: where to search for library files in addition to system paths. Xcode will set it automatically if you drag a library (.a files) into the project. To set it manually, use the directory where the library is located.
In xcconfig files you use this variable:
LIBRARY_SEARCH_PATHS = "/path/to/libraries/container/directory"
All three can hold a list of paths, with quotes, separated by space.