Dear R developer, we are trying to build DLL files using Microsoft Visual C++. As stated in readme.packages, we have to build first the import library Rdll.lib with the command: lib /def:R.exp /out:Rdll.lib. However, this command gives 2155 errors due to unresolved external symbols (ATTRIB to zlibversion) in Rexp. Could anybody tell me if something is missing in the command line or suggest any new operation knowing that for building DLL files with MVC++ we don't need to create a shared library with Rcmd SHLIB like it is written in R manuals. Thx a lot --------------------------------- [[alternate HTML version deleted]]