Node: Alpha OSF/1 V4.0, Next: BSDI, Previous: Alpha OSF/1 V2.0, Up: OS Incompatibilities

### Alpha OSF/1 (Digital UNIX) V4.0

The C compiler provided with Alpha OSF/1 V4.0 (a.k.a. Digital UNIX) defaults to an extended K&R C mode, not ANSI C. You need to provide the `-std` argument to the compiler (i.e., `./configure CC='cc -std'`) to enable extended ANSI C mode. More recent versions of the operating system, such as 5.0, seem to have C compilers which default to `-std`.