D-Programming-Language/druntime — pull request #769 by dsp (2014-04-19 21:56:53+00:00)
Title: Add ENOTSUP for linux, which maps to EOPNOTSUPP

glibc aliases ENOTSUP to EOPNOTSUPP.

Therefore declare ENOTSUP as EOPNOTSUPP on linux platforms as well.

This usually works and should work in D as well:
```C
#include
#include

int main(int argc, char * argv[]) {
printf("ENOTSUP: %d\n", ENOTSUP);
printf("EOPNOTSUPP: %d\n", EOPNOTSUPP);
return 0;
}
```