I want to add 'I' option on making enrollment on sscep-0.9.0 version to use specific ip address on multi ethernet port.

[half200]

I have 4 port(em0, em1, em2, em3) on Ethernet card.
em0 : 172.16.10.1
em1 : 172.16.10.2
em2 : 172.16.10.3
em3 : 172.16.10.4
I compiled sscep-0.9.0 version on openBSD7.1.
I want to add '-I option' on making enrollment to use em1 port(172.16.10.2) of multi port.
I don't know c language.
#./sscep enroll -u http://172.16.1.1/certsrv/mscep/mscep.dll -c ./ca.crt-0 -e ./ca.crt-1 -l ./local.crt -k .local.key -r local.csr -I 172.16.10.2
please help me!