GNU Parallel Bug Reports parallel not functional on Solaris 10

[Henry Bent]

parallel --version
GNU parallel 20181022

...

Running on Solaris 10 1/13 x86, any spawned job is preceded by a stray "2".  Example:

% parallel --verbose -k echo ::: A B C > abc-file
2 echo A
2 echo B
2 echo C
2: Command not found.
2: Command not found.
2: Command not found.

I tested with both the system's perl (5.8.4) and my own compile of perl 5.26.2.  I am at a loss as to what is happening here.

-Henry