Linker error with C++ std lib on Linux

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The best approaches to take (in order of preference):

  1. rebuild your library to use libc++
  2. add a dependency on libstdc++ to your module (PublicAdditionalLibraries.Add(“stdc++”))
  3. set the environment variable UE4_LINUX_USE_LIBCXX to 0 and recompile Unreal.

Rationale: if you’re planning to redistribute the resulting Unreal project across Linux distros, you may run into problems with compatibility of libstdc++.so. You cannot bundle libstdc++.so with your Unreal project or link it statically (at least without consulting the lawyer), so you are better off using libc++ which can be freely bundled.