Hi Cafe, I have the following program: ========================= module Main where import Text.Regex.Posix main = do putStrLn "!!!" ========================= When I run the main function from within GHCi, I get the following output from GHCi: ========================= Loading package array-0.5.0.0 ... linking ... done. Loading package deepseq-1.3.0.2 ... linking ... done. Loading package containers-0.5.4.0 ... linking ... done. Loading package bytestring-0.10.4.0 ... linking ... done. Loading package transformers-0.3.0.0 ... linking ... done. Loading package mtl-2.1.2 ... linking ... done. Loading package regex-base-0.93.2 ... linking ... done. Loading package regex-posix-0.95.2 ... linking ... <interactive>: warning: isupper from msvcrt is linked instead of __imp_isupper <interactive>: warning: toupper from msvcrt is linked instead of __imp_toupper <interactive>: warning: tolower from msvcrt is linked instead of __imp_tolower <interactive>: warning: isalpha from msvcrt is linked instead of __imp_isalpha <interactive>: warning: isalpha from msvcrt is linked instead of __imp_isalpha <interactive>: warning: isalpha from msvcrt is linked instead of __imp_isalpha <interactive>: warning: iscntrl from msvcrt is linked instead of __imp_iscntrl <interactive>: warning: isupper from msvcrt is linked instead of __imp_isupper <interactive>: warning: isgraph from msvcrt is linked instead of __imp_isgraph <interactive>: warning: isprint from msvcrt is linked instead of __imp_isprint <interactive>: warning: ispunct from msvcrt is linked instead of __imp_ispunct <interactive>: warning: isalnum from msvcrt is linked instead of __imp_isalnum <interactive>: warning: isalpha from msvcrt is linked instead of __imp_isalpha <interactive>: warning: isalnum from msvcrt is linked instead of __imp_isalnum <interactive>: warning: isalnum from msvcrt is linked instead of __imp_isalnum <interactive>: warning: isalnum from msvcrt is linked instead of __imp_isalnum <interactive>: warning: isalnum from msvcrt is linked instead of __imp_isalnum <interactive>: warning: isalnum from msvcrt is linked instead of __imp_isalnum <interactive>: warning: isalnum from msvcrt is linked instead of __imp_isalnum <interactive>: warning: isalnum from msvcrt is linked instead of __imp_isalnum <interactive>: warning: isalnum from msvcrt is linked instead of __imp_isalnum <interactive>: warning: isalnum from msvcrt is linked instead of __imp_isalnum <interactive>: warning: isalnum from msvcrt is linked instead of __imp_isalnum <interactive>: warning: isalnum from msvcrt is linked instead of __imp_isalnum <interactive>: warning: isalnum from msvcrt is linked instead of __imp_isalnum done. !!! *Main> ========================= Does anyone have an idea why GHCi is even linking against msvcrt? And is there a way to fix this? I am using GHC 7.8.1 RC2 x64 on Windows 8 x64 Regards --Rouan