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Besides getting intel64-sandybridge stage3 file, I have also set variables: CHOST x86_64-pc-linux-gnu CFLAGS -march=corei7-avx -O2 -pipe I do not think it is a good idea to bother cups/networkmanager/other package developers/maintainers, because that does not appear to be package specific. I would say systemwide instead. I removed everything and started from scratch, going back one step to intel64-nehalem subarch (with a corresponding CFLAGS change), all illegal instructions have gone like a magic. So to summarize, I know how to fix it, but have no idea why it did not work with an original configuration. Thanks.

I solved a similar problem in an opposite way, by forcing it to run in python2.7 (eselect python showed 3.4 as a default)

Well, maybe I started the topic from the wrong question. Does getting "Illegal instruction" message have a most possible cause of choosing a wrong subarchitecture at first place? Response much appreciated.

Hi all, I carefully reviewed my CPU info and googled to see the proper architecture Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz That points to intel64-sandybridge However, using that architecture I receive "Illegal instruction" error during various steps (e.g. compiling cups or running NetworkManager) I do not want to be "too safe" and choose a generic architecture. Could you please point to the right one closest to that particular CPU? Thank you