Sorry for my ignorance but how can I find that out?

Run: echo $PATH
The output needs to include the location of gdlib-config - which, I'm assuming, is /opt/local/bin.

If the location of the gdlib-config file is not specified in $PATH, then you need to add that location to $PATH: 
export PATH=/opt/local/bin:$PATH

[download]
Cheers,
Rob

In reply to Re^5: Installing external libraries for perlbrew perl by syphilis
in thread Installing external libraries for perlbrew perl by bangor

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