lafilefixer is not the right tool for this. At least it's current scope is to replace usage of la files in la files, not to replace occurences of one lib with another. Plus the problem of lafilefixer not changing the hash of the installed files to match the one recorded in vdb is not solved so I'd rather have clear instructions on how to rebuild the minimum amount of packages if possible.
I've seen something like emerge -1av $(egrep "libpng12.la" /usr/lib/*.la | qfile --someoption) which just as with xorg/libxcb migration should do just fine. -- Gilles Dartiguelongue <e...@gentoo.org> Gentoo
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