Undefined symbols for architecture arm64: "_iconv_open", referenced from: _q

解答：

After Xcode 7, Apple did a lot to strip the size of apps, including changing .dylib to .tbd.

Here you don't need to add library & framework but you can add the library by changing the following option:

Other Linker Flags > Add "-l{yourlibraryname} (no space after -l)

In your case, you can add -liconv in Other Linker Flags.

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xcode7: Undefined symbols for architecture i386: "_iconv_open", referenced from: