[markh]

Which env variable should I be setting? I am using tcsh.

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Hmm, did some more digging and it seems that in order to use the directory /usr/nekoware/certs I need to split up the cacert.pem file into a file per certificate. I tested it with the ISRG Root X1 certificate which is needed by https://curl.se and then curl can connect fine.
I looked for a script to split the file and found https://stackoverflow.com/questions/2364...s#25316445 but the answers there don't seem to work on Irix or I am doing something wrong. I don't have a lot of experience with regular expressions, so I am not too sure what is wrong.