Node: HPUX, Next: Solaris versions 2.0 through 2.3, Previous: BSDI, Up: OS Incompatibilities

### HPUX

The native (bundled) compiler for HPUX currently will not work, because it is not a full ANSI C compiler. The optional ANSI C compiler should work as long as you give it the `-Ae` flag (i.e. `./configure CC='cc -Ae'`). This is equivalent to `./configure CC='c89 -D_HPUX_SOURCE'`, which was the previous recommendation. This has only been tested recently for HPUX 10.20.