in reply to Re^4: Installing external libraries for perlbrew perl
in thread Installing external libraries for perlbrew perl

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
Cheers,
Rob

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Re^6: Installing external libraries for perlbrew perl
by bangor (Monk) on Dec 19, 2013 at 05:23 UTC
    Thanks Rob, that did the trick - see my update above.