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(Imported from Trac #944, reported by PaulVanDerWalt on 2012-04-22)
I've run into a problem where I want to include the vty and haskeline packages, which both contain the same C code, of which the symbol names are not translated or made unique. When I use both packages, and try to compile something which has Template Haskell (which triggers loading of all dependencies), I get the following error.
GHCi runtime linker: fatal error: I found a duplicate definition for symbol
whilst processing object file
A workaround is to patch the libraries to make the function names unique, but this is less than ideal.