DH parameters and DH private Key

[shivakumar Balur]

HI All,

    when i tried to generate DH parameters using : openssl genpkey -genparam
-algorithm DH -out dhp.pem -pkeyopt dh_paramgen_prime_len:1024

ERROR:
error: openssl:Error: 'genpkey' is an invalid command.

Can any one help me in this or any other commands to generate DH parameter n
DH Key.

-- 
Regards,
Shivakumar