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Am I likely to encounter any problems removing the build dependencies after installing a package from the aur? Specifically, installing firefox-branded pulls in lots of gnome stuff I don't want as it has libgnomeui>=2.24.1 in makedepends. Once its built and up and running, can I remove libgnomeui et al via pacman -Rns?
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Running
pacman -Qdt
will get you a list of packages that were installed as dependencies but are no longer needed by any package. These can be safely uninstalled.
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You can use bauerbill for aur handling. It will automatically uninstall unnecessary build time dependencies and is recommended in general.
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