As seen in https://github.com/dimitri/pgloader/issues/437 it is possible to have OpenSSL related error messages when using a pre-built pgloader:
Undefined alien: "SSL_CTX_set_default_verify_dir"
To solve:
sudo apt remove libssl-dev
/usr/local
pgloader-dir/build/bin/pgloader
undefined alien SSL_CTX_set_default_verify_dir
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