LDC can't custom msvc package,must install visual studio .net ?

[kinke via digitalmars-d-ldc]

We don't really support VS 2012 anymore and require VS 2013+ now. 
Anyway, if your environment variables are already set (INCLUDE, 
LIB, LIBPATH, PATH, VSINSTALLDIR etc. - e.g., in a 'VS Tools 
Command Prompt'), LDC doesn't attempt to detect the VS 
installation folder.
I definitely wouldn't recommend copying only some files and 
folders from an existing VS installation though. Instead, you may 
want to customize the VS installation and pick only Visual C++ 
(and an appropriate Windows SDK) for your target platform, if 
required disk space is really a concern.