What are the barriers to adding C support to dub?

[Chris Piker]

I am curious to know what barriers prevent dub from supporting C 
source code compilation.

I have seen many wrapper projects mentioned here, but I think all 
of these leave handling of external fortran/C/C++ source packages 
to other systems.  This makes sense for large projects such as 
Qt.  However, for new D programmers, original C sources may 
slowly disappear over time while continuing to supply key 
functionality for quite a while and I presume that getting new 
programmers is a central goal of the community.

Since dub already works with compilers other than dmd, how much 
work would it take to make it work with other llvm/gcc supported 
languages such as fortran/c/c++ ?

Are there fundamental non-technical reasons that support for 
selected external languages in dub is a bad idea?

Maybe these are naive questions.

I found dub to be especially handy in the wild-west environment 
of Windows programming and would like to rely on it a bit more.

Kind Regards,