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I need libtxc-dxtn for some native Linux games to start (Amnesia). Without it, the game crashes. If I install it, the colors some other games drastically change. So, I install and un-install the package, depending on what I have to start.

Is there a way to provide the lib to the apps that only need it? I hope my question is clear enough

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This is probably going to be a pain, but have you tried running the games that don't use libtxc-dxtn in a chroot envorinment?(See and – hexafraction Jun 5 '12 at 20:16
Look into extracting the shared libraries in the package in an alternate location and then using LD_PRELOAD and/or modifying LD_LIBRARY_PATH. – izx Jun 6 '12 at 9:27
Link how to do this? Tried by got core dumped error... – deckoff Jun 6 '12 at 14:39
up vote 0 down vote accepted
LD_PRELOAD='/home/deckoff/Desktop/libtxc/' /opt/amnesia/Launcher.bin

This did the trick. Lib was marked as executable, owner is root, not user.( dont know if this is needed or not). I have made a syntax error in my first tries- I have left some space between "=" and "'", there should not be any.

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