Ah, OK, thanks for digging that up. As I mentioned OSS came into existence in the early 1990s.
Off the subject of these endless pragma issues, but I feel compelled to point out for the record that rms started GNU in 1983 (http://www.gnu.org/gnu/gnu-history.html). Granted GNU is not part of "open source" (which started in 1998 afaik; http://www.gnu.org/philosophy/open-source-misses-the-point.html), but I suspect you don't technically mean "open source". Best, karl