7 Building non-core clients with SVR4

A lot of clients (even some which have explicit SVR4 support) require -DSYSV when building under SVR4. This will not be set when using the default configuration. A quick fix is to add something like the following to the client's Imakefile:
```
      #if SystemV4
           DEFINES = -DSYSV OTHER_CLIENT_DEPENDENT_DEFINES
      #endif
```
The best solution is to modify the code so it compiles correctly without -DSYSV.
The default compiler options include `-ansi' for gcc, and `-Xc' for cc. A consequence of this is __STDC__ gets #defined to `1'. There are a number of functions which will not have prototypes declared unless either __STDC__ is not defined, or
```
        __STDC__ == 0 || defined(_POSIX_SOURCE) || defined(_XOPEN_SOURCE)
```
Possible solutions are to change the definition of CCOPTIONS by adding a line to the Imakefile, or to add the required prototypes to the source.

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