The following platforms were supported in the past, but are no longer supported:
Gnulib supports these operating systems only in an unvirtualized environment.
When you run an OS inside a virtual machine, you have to be aware that the
virtual machine can bring in bugs of its own. For example, floating-point
operations on Solaris can behave slightly differently in QEMU than on real
hardware. And Haiku’s
bash program misbehaves in VirtualBox 3,
whereas it behaves fine in VirtualBox 4.
Similarly, running native Windows binaries on GNU/Linux under WINE is rarely tested and low priority: WINE has a set of behaviours and bugs that is slightly different from native Windows.