Hi,
the file main.cpp does not compile on my system, because it can't find iostream.h.
This might be correct since iostream.h is for c++, while main.cpp seems to be standard c (although the extension seems to suggest otherwise). simply removing the line #include <iostream.h> fixes this problem. The executable builds and I have succesfully converted a dwg file to dxf.
One thing I noticed in my ./configure is that cross compiling is not supported on my system: is it relevant?
configuration of my system