[gtkmm] DLL support for MSVC/Borland

["Andrew E. Makeev" <andrew solvo ru>]

Good day,

There is a problem.
Could you explain, please, how to build DLLs properly from sources using
MSVC or Borland compilers?

There is not enough <XXX>MM_API declarations in built sources to allow
compiler to create working DLLs.

Is there any configure options that will force source generator to add
<XXX>MM_API declaration where it's needed?

thanks in advance,
-andrew