如何将Borland C ++构建器的代码移植到Linux？

I have source code for a Windows DLL that is written in C++ and uses Visual Component Library. Now my task is to port that to Linux, but I don't have source code for the VCL itself, or any kind of documentation (and I have never worked with Borland C++; in my Windows days I used MFC).I have source code for a Windows DLL that is wr