@darix I haven’t understood what’s being discussed here. However, there’s an issue with symbol visibility on Exiv2::BasicError reported this morning exiv2 0.27+ on darwin fails with Exiv2::BasicError<char> error · Issue #644 · Exiv2/exiv2 · GitHub
We believe it’s fixed in ‘master’, however we’ll do more investigation to understand both the issue and the fix.
The fix will be in Exiv2 0.27.1 on 2019-03-31 I intend to publish Exiv2 0.27.1 RC1 in early March. Feedback concerning this (and any other matter) is always welcome.