Hi :) if a dedicated version of a dependency is needed, some packages mention it, others don't. Firefox does not explicitly mention a version of libvpx $ pacman -Si firefox | grep On Depends On : [snip] libvpx [snip] but it needs a dedicated version $ firefox XPCOMGlueLoad error for file /usr/lib/firefox/libxul.so: libvpx.so.2: cannot open shared object file: No such file or directory Couldn't load XPCOM. ffmpeg does mentions that a dedicated version is needed $ pacman -Si ffmpeg | grep On Depends On : [snip] libvpx.so=2-64 [snip] IMO official packages should mention dedicated versions, since for users of a rolling release, there sometimes are good reasons to downgrade. I tried to build Firefox from ABS against the outdated version of libvpx that is needed and installed on my system, but that's another issue. Perhaps other packages are broken too and I get aware of it, at an inconvenient time. How can I figure out what packages depend on a dedicated version of another package? Regards, Ralf
