I just got an error report form someone using Perl 5.8.0 under HP-UX 11.11 that he gets this error message from make test when he tries to install Mail::Sender. The code that causes this message is : 

BEGIN {
    if ($] >= 5.008) {
        # fsck, the 5.8 is broken. The binmode() doesn't work for sock
+et()s.
        require 'open.pm';
        'open'->import(OUT=>":raw :perlio");
    }
}

[download]
(see this for discussion on why am I using this piece of code.)

I assumed :raw is a "builtin" discipline and therefore its safe to use anywhere. Am I wrong? I do not get any such message myself (ActivePerl 5.8 build 805, Win2kServer), I did not get any such report before and CPAN Testers report success (under Linux, Solaris and FreeBSD).

Does anyone have any suggestions?

perl -V on that computer:

Summary of my perl5 (revision 5.0 version 8 subversion 0) configuratio
+n:
  Platform:
    osname=hpux, osvers=11.11, archname=PA-RISC2.0-LP64-stdio
    uname='hp-ux ux15 b.11.11 u 9000800 136901557 unlimited-user licen
+se '
    config_args='' hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef
usemultiplicity=undef
    useperlio=undef d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=define use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags =' -Ae -D_HPUX_SOURCE -Wl,+vnocompatwarnings
-I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 ',
    optimize='+O2 +Onolimit',
    cppflags='-Aa -D__STDC_EXT__ -D_HPUX_SOURCE -Ae -D_HPUX_SOURCE
-Wl,+vnocompatwarnings -I/usr/local/include'
    ccversion='B.11.11.04', gccversion='', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=87654321
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=1
+6
    ivtype='long long', ivsize=8, nvtype='double', nvsize=8,
    Off_t='off_t',
lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='/usr/bin/ld', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib /usr/ccs/lib
    libs=-lcl -lpthread -lnsl -lnm -lndbm -lmalloc -ldld -lm -lc -lndi
+r
-lcrypt -lsec
    perllibs=-lcl -lpthread -lnsl -lnm -lmalloc -ldld -lm -lc -lndir
    -lcrypt
-lsec
    libc=/lib/libc.sl, so=sl, useshrplib=false, libperl=libperl.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_hpux.xs, dlext=sl, d_dlsymun=undef, ccdlflags='-Wl,-E
-Wl,-B,deferred '
    cccdlflags='+Z', lddlflags='-b +vnocompatwarnings -L/usr/local/lib
+'


Characteristics of this binary (from libperl):
  Compile-time options: USE_64_BIT_INT USE_LARGE_FILES
  Built under hpux
  Compiled at Apr  8 2003 10:44:22
  @INC:
    /opt/perl5/lib/5.8.0/PA-RISC2.0-LP64-stdio
    /opt/perl5/lib/5.8.0
    /opt/perl5/lib/site_perl/5.8.0/PA-RISC2.0-LP64-stdio
    /opt/perl5/lib/site_perl/5.8.0
    /opt/perl5/lib/site_perl

[download]

Jenda
Always code as if the guy who ends up maintaining your code will be a violent psychopath who knows where you live.
   -- Rick Osborne

20030408 Edit by Corion: Added readmore tags per authors request

In reply to Unknown discipline 'raw' at .../IO/Handle.pm line 355 under HP-UX by Jenda

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