Hi, I'm new to Haskell so I'm not sure how to solve this issue, yet. I was directed to this list from the IRC channel. Here's the issue: Using GHCi on OS X: Prelude Data.Text> :m Text.Regex Prelude Text.Regex> let r = mkRegex "_" ... eliding successful "Loading package ..." lines ... Loading package regex-compat-0.95.1 ... can't load .so/.DLL for: /Library/Haskell/ghc-7.8.3-x86_64/lib/regex-compat-0.95.1/libHSregex-compat-0.95.1-ghc7.8.3.dylib (dlopen(/Library/Haskell/ghc-7.8.3-x86_64/lib/regex-compat-0.95.1/libHSregex-compat-0.95.1-ghc7.8.3.dylib, 9): Library not loaded: @rpath/libHSmtl-2.1.3.1-ghc7.8.3.dylib Referenced from: /Library/Haskell/ghc-7.8.3-x86_64/lib/regex-compat-0.95.1/libHSregex-compat-0.95.1-ghc7.8.3.dylib Reason: image not found) After running otool over the regex-compat dylib I can see lines like: ... Load command 24 cmd LC_RPATH cmdsize 80 path /Users/mark/Projects/hp/build/package/mtl-2.1.3.1/build/dist/build (offset 12) ... Which is not a path that is relevant to my installation. It was suggested that this may be an error in the way packages are being built for OS X. Whatever the cause, I'm bringing it to the attention of this list in order to gain information on what course to take in addressing this issue. Thanks for your help. Kind regards, Peter Sumskas.