That was the ticket, @ryan!
@izgeri: I upvote this contribution to upstream! 
vagrant@guixsd ~ [env]$ summon -h; summon-conjur -h
NAME:
summon - Parse secrets.yml and export environment variables
USAGE:
summon [global options] command [command options] [arguments...]
VERSION:
0.8.2
COMMANDS:
help, h Shows a list of commands or help for one command
GLOBAL OPTIONS:
-p value, --provider value Path to provider for fetching secrets
-e value, --environment value Specify section/environment to parse from secrets.yaml
-f value Path to secrets.yml (default: "secrets.yml")
--up Go up in the directory hierarchy until the secrets file is found
-D value var=value causes substitution of value to $var
--yaml value secrets.yml as a literal string
--ignore value, -i value Ignore the specified key if is isn't accessible or doesn't exist
--ignore-all, -I Ignore inaccessible or missing keys
--all-provider-versions, -V List of all of the providers in the default path and their versions(if they have the --version tag)
--help, -h show help
--version, -v print the version
Usage of summon-conjur:
-h, --help
show help
-V, --version
show version
-v, --verbose
be verbose