One of the stranger behaviors of TenDRA was that it put all standard library symbols, including the C headers, into namespace std. A hello world in TenDRA looked like this:
#include <cstdio> // no <stdio.h> available
int main() {
std::printf("Hello, world!\n");
return 0;
}
I ended up writing a bunch of utilities for strings, including a unit testing library that spawned each test as a subprocess (to avoid exceptions) just so I could use GCC instead.
[0] There is no such version recorded on the GNU project website.