Fixing eeshow library lookup (not found) another option

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I put it here because:

1. I started my patch using what you can find in the following topic (on this forum):

Fixing eeshow library lookup (not found)

Just wanted to document this: I have built eeshow according to Building eeshow on Ubuntu 14.04. Then I had a problem - no matter what project I opened, I couldn’t get symbols found in libraries; pretty much every symbol referenced in schematic resulted with e.g. "device:LED" not found and so on. First of all, the KiCad version I use (which produced the projects) is: Application: kicad Version: (2017-11-13 revision d98fc85)-master, release build Libraries: wxWidgets 3.0.2 libcurl/7.35.0…

2. The category is “External Plugins”, which seems more or less what eeshow is.