Obviously something wasn't made or configured properly. It would be a good idea to do a:
to see what options are offered. Since the "po" directory is used for internationalization (contains translations) see if you can disable that in when doing the configure step.
Either that or just do an apt-get install gimp. Libranet uses the same packageing tools that Debian uses, and since apt resolves dependencies automatically, it would be considerably easier.
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