Alternate config files

I have an alternate config files that I want analog to use.  


analog +G -galt_config.cfg

However, I have multiple config files, so to keep it organized, I have a
specific directory for them:

/usr/local/analog-6.03/lib_analog_config

I've tried using the directory path in the statement that provides the
location of the config file, but it doesn't seem to work properly:

analog +G -g/usr/local/analog-6.03/lib_analog_config/alt_config.cfg


What is the correct syntax to use to specify alternate config files in other
directories?

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