+add_extra_libs :: Hook a -> Hook a
+add_extra_libs f pd lbi uhs x
+ = let pd' = if (os == "mingw32") && (compilerFlavor (compiler lbi) == GHC)
+ then case library pd of
+ Just lib ->
+ let lib_bi = libBuildInfo lib
+ lib_bi' = lib_bi { extraLibs = "wsock32"
+ : "msvcrt"
+ : "kernel32"
+ : "user32"
+ : "shell32"
+ : extraLibs lib_bi }
+ lib' = lib { libBuildInfo = lib_bi' }
+ in pd { library = Just lib' }
+ Nothing -> error "Expected a library"
+ else pd
+ in f pd' lbi uhs x
+