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+If you read this file _as_is_, just ignore the funny characters you see.
+It is written in the POD format (see pod/perlpod.pod) which is specially
+designed to be readable as is.
+
+=head1 NAME
+
+README.tru64 - Perl version 5 on Tru64 (formerly known as Digital UNIX formerly known as DEC OSF/1) systems
+
+=head1 DESCRIPTION
+
+This document describes various features of HP's (formerly Compaq's,
+formerly Digital's) Unix operating system (Tru64) that will affect
+how Perl version 5 (hereafter just Perl) is configured, compiled
+and/or runs.
+
+=head2 Compiling Perl 5 on Tru64
+
+The recommended compiler to use in Tru64 is the native C compiler.
+The native compiler produces much faster code (the speed difference is
+noticeable: several dozen percentages) and also more correct code: if
+you are considering using the GNU C compiler you should use at the
+very least the release of 2.95.3 since all older gcc releases are
+known to produce broken code when compiling Perl.  One manifestation
+of this brokenness is the lib/sdbm test dumping core; another is many
+of the op/regexp and op/pat, or ext/Storable tests dumping core
+(the exact pattern of failures depending on the GCC release and
+optimization flags).
+
+gcc 3.2.1 is known to work okay with Perl 5.8.0.  However, when
+optimizing the toke.c gcc likes to have a lot of memory, 256 megabytes
+seems to be enough.  The default setting of the process data section
+in Tru64 should be one gigabyte, but some sites/setups might have
+lowered that.  The configuration process of Perl checks for too low
+process limits, and lowers the optimization for the toke.c if
+necessary, and also gives advice on how to raise the process limits.
+
+Also, Configure might abort with
+
+    Build a threading Perl? [n]
+    Configure[2437]: Syntax error at line 1 : `config.sh' is not expected.
+
+This indicates that Configure is being run with a broken Korn shell
+(even though you think you are using a Bourne shell by using
+"sh Configure" or "./Configure").  The Korn shell bug has been reported
+to Compaq as of February 1999 but in the meanwhile, the reason ksh is
+being used is that you have the environment variable BIN_SH set to
+'xpg4'.  This causes /bin/sh to delegate its duties to /bin/posix/sh
+(a ksh).  Unset the environment variable and rerun Configure.
+
+=head2 Using Large Files with Perl on Tru64
+
+In Tru64 Perl is automatically able to use large files, that is,
+files larger than 2 gigabytes, there is no need to use the Configure
+-Duselargefiles option as described in INSTALL (though using the option
+is harmless).
+
+=head2 Threaded Perl on Tru64
+
+If you want to use threads, you should primarily use the Perl
+5.8.0 threads model by running Configure with -Duseithreads.
+
+Perl threading is going to work only in Tru64 4.0 and newer releases,
+older operating releases like 3.2 aren't probably going to work
+properly with threads.
+
+In Tru64 V5 (at least V5.1A, V5.1B) you cannot build threaded Perl with gcc
+because the system header <pthread.h> explicitly checks for supported
+C compilers, gcc (at least 3.2.2) not being one of them.  But the
+system C compiler should work just fine.
+
+=head2 Long Doubles on Tru64
+
+You cannot Configure Perl to use long doubles unless you have at least
+Tru64 V5.0, the long double support simply wasn't functional enough
+before that.  Perl's Configure will override attempts to use the long
+doubles (you can notice this by Configure finding out that the modfl()
+function does not work as it should).
+
+At the time of this writing (June 2002), there is a known bug in the
+Tru64 libc printing of long doubles when not using "e" notation.
+The values are correct and usable, but you only get a limited number
+of digits displayed unless you force the issue by using C<printf
+"%.33e",$num> or the like.  For Tru64 versions V5.0A through V5.1A, a
+patch is expected sometime after perl 5.8.0 is released.  If your libc
+has not yet been patched, you'll get a warning from Configure when
+selecting long doubles.
+
+=head2 DB_File tests failing on Tru64
+
+The DB_File tests (db-btree.t, db-hash.t, db-recno.t) may fail you
+have installed a newer version of Berkeley DB into the system and the
+-I and -L compiler and linker flags introduce version conflicts with
+the DB 1.85 headers and libraries that came with the Tru64.  For example, 
+mixing a DB v2 library with the DB v1 headers is a bad idea.  Watch
+out for Configure options -Dlocincpth and -Dloclibpth, and check your
+/usr/local/include and /usr/local/lib since they are included by default.
+
+The second option is to explicitly instruct Configure to detect the
+newer Berkeley DB installation, by supplying the right directories with
+C<-Dlocincpth=/some/include> and C<-Dloclibpth=/some/lib> B<and> before
+running "make test" setting your LD_LIBRARY_PATH to F</some/lib>.
+
+The third option is to work around the problem by disabling the
+DB_File completely when build Perl by specifying -Ui_db to Configure,
+and then using the BerkeleyDB module from CPAN instead of DB_File.
+The BerkeleyDB works with Berkeley DB versions 2.* or greater.
+
+The Berkeley DB 4.1.25 has been tested with Tru64 V5.1A and found
+to work.  The latest Berkeley DB can be found from F<http://www.sleepycat.com>.
+
+=head2 64-bit Perl on Tru64
+
+In Tru64 Perl's integers are automatically 64-bit wide, there is
+no need to use the Configure -Duse64bitint option as described
+in INSTALL.  Similarly, there is no need for -Duse64bitall
+since pointers are automatically 64-bit wide.
+
+=head2 Warnings about floating-point overflow when compiling Perl on Tru64
+
+When compiling Perl in Tru64 you may (depending on the compiler
+release) see two warnings like this
+
+    cc: Warning: numeric.c, line 104: In this statement, floating-point overflow occurs in evaluating the expression "1.8e308". (floatoverfl)
+        return HUGE_VAL;
+    -----------^
+
+and when compiling the POSIX extension
+
+    cc: Warning: const-c.inc, line 2007: In this statement, floating-point overflow occurs in evaluating the expression "1.8e308". (floatoverfl)
+                return HUGE_VAL;
+    -------------------^
+
+The exact line numbers may vary between Perl releases.  The warnings
+are benign and can be ignored: in later C compiler releases the warnings
+should be gone.
+
+When the file F<pp_sys.c> is being compiled you may (depending on the
+operating system release) see an additional compiler flag being used:
+C<-DNO_EFF_ONLY_OK>.  This is normal and refers to a feature that is
+relevant only if you use the C<filetest> pragma.  In older releases of
+the operating system the feature was broken and the NO_EFF_ONLY_OK
+instructs Perl not to use the feature.
+
+=head1 Testing Perl on Tru64
+
+During "make test" the C<comp/cpp> will be skipped because on Tru64 it
+cannot be tested before Perl has been installed.  The test refers to
+the use of the C<-P> option of Perl.
+
+=head1 ext/ODBM_File/odbm Test Failing With Static Builds
+
+The ext/ODBM_File/odbm is known to fail with static builds
+(Configure -Uusedl) due to a known bug in Tru64's static libdbm
+library.  The good news is that you very probably don't need to ever
+use the ODBM_File extension since more advanced NDBM_File works fine,
+not to mention the even more advanced DB_File.
+
+=head1 Perl Fails Because Of Unresolved Symbol sockatmark
+
+If you get an error like
+
+    Can't load '.../OSF1/lib/perl5/5.8.0/alpha-dec_osf/auto/IO/IO.so' for module IO: Unresolved symbol in .../lib/perl5/5.8.0/alpha-dec_osf/auto/IO/IO.so: sockatmark at .../lib/perl5/5.8.0/alpha-dec_osf/XSLoader.pm line 75.
+
+you need to either recompile your Perl in Tru64 4.0D or upgrade your
+Tru64 4.0D to at least 4.0F: the sockatmark() system call was
+added in Tru64 4.0F, and the IO extension refers that symbol.
+
+=head1 AUTHOR
+
+Jarkko Hietaniemi <jhi@iki.fi>
+
+=cut