[bug-mailutils] Portability issues to hpux

[Bert Deknuydt]

Hello again,

This time I tried HPUX (hppa2.0w-hp-hpux11.00).

Again two issues here:

--> In the mail.local directory, mail.local.h uses sysexits.h if it
    exists.  On HPUX it does exist, but it lacks the entry for 
    EX_CONFIG.  

    Maybe a separate check for EX_CONFIG is needed in the configure...

--> A more nasty one: this construction (used in mail/alt.c)

    struct passwd *pw = getpwuid (getuid ());

    does not work on hpux when linked with -lc before -lthreads.        
    (it returs "can't determine my username"; getpwuid sets errno
     corresponding to 'invalid argument')

    The other way around (i.e. -lthreads -lc) works okay.    

    When you manually completely remove the '-lthreads' from the Makefile
    there, mail works.

Apart from this, all seems to work.

Greetings, Bert.

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