Ah, okay. I contend that Dell machines aren't computers because they rarely have green LEDs anymore, and surely all computers have green LEDs!
It is interesting to note that by your definition, Solaris, surely a highly traditional UNIX, was, for a long time, not a UNIX (it didn't ship with development tools).
Based on what you've posted,you'd have a hard time calling anything that. And I'm including AIX, SunOS/Solaris, HP-UX, etc.
What you want is a UNIX or UNIX-like OS that comes pre-installed with GNU-based development tools. This is a choice in configuration, not a definition of what UNIX is or isn't.