Technically it would have been in the original C complier written for the original unix by Ken Thompson and Dennis Ritchie, and been compiled in every complier

Technically it would have been in the original C complier written for the original unix by Ken Thompson and Dennis Ritchie, and been compiled in every complier and login utility since the 70s. At this point try finding a complier that doesn't trace is compiling lineage at some point reach back to a complier compiled by a complier that doens't eventually reach back to it may be pretty hard.