The use of object files compiled with Compaq Visual Fortran often yields a dfor.lib error. While the IVF software has a "help" capability - it recommends that one recompile the CVF object 'without explicit reference to dfor.lib' (not helpful, since I cannot do that).
The IVF composer Help utility was not helpful, and a www search led to this site- which also had only cryptic replies, none of which could be implemented. (we don't own the CVF source code, merely the object file)
The simpler answer is to obtain a CVF Library and add in the IVF-requested *.libs one at a time [In our cases, several 'missing library file' errors arose after dfor.lib was provided.], until the CVF Library Call error message (# ) disappears. You then get a _long list_ of errors, all of which reveal a conflict between existing IVF library files and the new CVF ones. Don't be discouraged by the large number of errors! Just add each IVF Library DLL to the "ignore specific file" list, again one at a time.
This will enable IVF source code to link to CVF-compiled Objects.