これウザい。Facebookのプラググイン入れてからか?
ld: library not found for -lPods-Unity-iPhone clang: error: linker command failed with exit code 1 (use -v to see invocation)
Unity5で 『 library not found for -lPods-Unity-iPhone』と出たら | 4★star
https://forum.unity.com/threads/library-not-found-lpods-unity-iphone.487853/