MinGW provides a development and runtime environment for x86 and x64 architectures. ParrotSec has support of this package by default, marked as mingw-w64.
However, some external application could need to build software using the old i586-mingw32msvc triplet, that’s why it would be necessary to get the mingw32 package.
Getting the Package
There is no support of the mingw32 package by default on Buster, this is why Wheezy and Jessie are its release lines.