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A question about 32bit applications

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linux-howto

https://bbs.archlinux.org – This is not about how to get 32bit applications to work on Arch linux. I don't have any problems with that.However, I've been trying to understand how certain applications know to look for their libs in /usr/lib32.I have to use firstclass for my job, and that is 32bit only. Firstclass works on 64bit via a wrapper that sets LD_LIBRARY_PATH to the /opt/lib32 folder (meh, I won't question that deprecated method). However, what about skype? Acrobat Reader (not that I use it)?  These are 32bit only, and they require arch's lib32... but how do they know to look for their lib (HowTos)