Root CA missing from Certificate Chain of Signed File

I am signing a file using the following command and the root CA is
missing from the certificate chain of the signed file.

openssl smime -sign -in filename.der -text -outform DER -out
filenameSigned.der -signer signature.pem -nodetach

If I include the -certfile option using the same signature.pem file,
then I get the root CA. However, the certificate chain is repeated
multiple times since I used the same .pem file for the -signer and
-certfile options.

The signature.pem file was created using the openssl pkcs12 command.

How can I get the root CA included in the certificate chain of the
signed file without having the certificate chain repeated multiple
times?

Thanks

Joe Fedak  
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