From Chris.Henrich@ILEX.COM

Dear Sirs​:

There is a subtle bug in the configuration mechanism of perl-5.6.0, that
appears when one installs
perl on a solaris_2.7 system and opts for maximal "64-bitness."

A "callback" script named use64bitall.cbu is created in directory
${src}/UU, and is invoked at line 4582 of Configure, while the current
working directory is $src/UU (see line 3452 of Configure).

Line 15 of use64bitall.cbu reads​:
  . ./UU/workshoplibpth.cbu
which would be all right if the current working directory were $src. Since
it is not, and since there is
no directory $src/UU/UU, the script fails at this point.

Where should it be fixed? Well, the callback, use64bitall.cbu, is
constructed during the execution of
$src/hints/solaris_2.sh. Starting at line 402 of the latter script, code is
concatenated into
the callback, with the problem line at line 417. That line should be
changed to
  . ./workshoplibpth.cbu

Now there are other similar lines in solaris_2.sh (lines 80, 461, and 492);
should they be changed also? By no means. They are invocations directly
in-line, executed when solaris_2.sh is executed.
Line 417 is the only one which is not executed here but copied into a
callback script.

Thank you all for posing an interesting and challenging problem.

Sincerely
Chris Henrich