I've spent too little time with the recent standards/draft to give a specific answer. But I have a general attitude: C89 with extensions or C99 were just perfec

I've spent too little time with the recent standards/draft to give a specific answer. But I have a general attitude: C89 with extensions or C99 were just perfect for almost any purpuse; newer standards may well correct minor inadequacies or integrate things, that used to be implemented by proven libraries, directly into the language; but the price for these relatively minor improvements is high; people who write supposedly reusable code in the newer standards effectively force all older projects to switch to the newer standard; the costs of this are rarely justifiable. And there is C11 which made mandatory parts of the C99 standard optional, thus breaking backwards compatibility.